What was the significance to India of the Persian conquest of the Indus Valley and Kashmir under Emperor Darius in the sixth century B.C.E.?

Answer:

Henry Mosley' chart was more accurate because he used 'atomic number' as the organizing principle to organize elements in its right places.Whereas Mendeleeve organized elements according to their relative atomic mass and this was giving him some problem.

Mosley's periodic chart was more accurate at predicting the placement of new elements due to its use of atomic number, whereas Mendeleev's chart was based on atomic mass.

Mendeleev and Mosley both contributed to the development of the periodic table. However, the chart used by Mosley was more accurate at predicting the placement of new elements because Mosley's chart was based on the concept of atomic number, while Mendeleev's chart was based on atomic mass.

Atomic number is the number of protons in an atom's nucleus, while atomic mass is the total mass of protons and neutrons in an atom. Mosley's chart arranged elements in order of increasing atomic number rather than atomic mass.

This arrangement allowed for a more accurate placement of elements, as it accounted for variations in atomic mass caused by differences in the number of neutrons. As a result, Mosley's chart was able to predict the placement of new elements more accurately than Mendeleev's chart.

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Answer:

a. the K+ ions are attracted to the partial negative charge on the oxygen atom of the water molecule.

Explanation:

The hydrogen atoms on water are partially positive and the oxygen on water is partially negative.

Since unlike charges attract, the oxygen of the water molecules are attracted to the K+ and the hydrogens are attracted to Cl-.  the water surrounds the k+ and cl- so that the unlike charges are allowed to be close together.

The proper response to KCl dissolving in water is e. the Cl- ions are attracted to dissolved K+ ions.

The ionic compound KCl separates into the ions K+ and Cl- when it is introduced to water. The partial negative charges on the oxygen atoms in the water molecules are what draw the positive K+ ions to them. At the same time, the partial positive charges on the hydrogen atoms of the water molecules draw the negative Cl- ions towards them. Ion-dipole interactions are the name for this attraction between ions and water molecules.

In the case of KCl, the dissolved K+ ions in the solution selectively attract the Cl- ions. Due to the polar nature of the individual ions, the water molecules form a hydration shell around them.

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The pressure in the flask after the reaction is complete is approximately 1.84 atm, calculated using the Ideal Gas Law.

This question applies the Ideal Gas Law. The balanced chemical reaction is 2SO2 + O2 → 2SO3. So, for every 2 moles of SO2, 1 mole of O2 is required and 2 moles of SO3 are produced. Given that the moles of SO2 and O2 both are 0.20 mol, all the SO2 and half of O2 will react to form 0.20 mol of SO3 leaving only 0.10 mol of O2 unreacted in the flask. Therefore, the total number of moles of gases in the flask after reaction is 0.20 mol SO3 + 0.10 mol O2 = 0.30 mol. Applying the Ideal Gas Law: Pressure (P) = nRT/V, where n = total no. of moles = 0.30 mol,R = universal gas constant = 0.0821 L·atm/(mol·K),T = temperature in Kelvin = 25ºC + 273.15 = 298.15 K, V = volume = 4.0 L. After substituting these values in the formula, we calculate the pressure to be roughly 1.84 atm.

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After reacting 0.20 mol each of SO2 and O2 to form SO3 in a 4.0 L flask at 25°C, the pressure in the flask would be 2.46 atm.

The question presented involves the application of the Ideal Gas Law and stoichiometric relations in chemistry. Given that we have 0.20 mol of SO2 and 0.20 mol of O2 that react to form SO3, the first step is to use the balanced equation of the reaction: 2SO₂(g) + O₂(g) → 2SO₃(g). In this reaction, the total moles of gas would remain unchanged before and after the reaction. Therefore, the total number of moles of gas in the flask after the reaction would still be 0.20 + 0.20 = 0.40 mol.

Using the Ideal Gas Law PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant (0.0821 L·atm/mol·K), and T is temperature in Kelvin (25°C = 298K), we can calculate the pressure. Plugging in the given values: P = nRT/V = (0.4 mol)(0.0821 L.atm/mol.K)(298 K) / 4.0 L = 2.46 atm. Thus the pressure in the flask after the reaction is complete would be 2.46 atm.

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Answer: solutions that would be expected to contain the greatest number of solute particles (molecules or ions) is

1 L of 1.0 M NaCl

Answer:

12.2 moles of H₂

Explanation:

P . V = n . R . T is the Ideal Gases Law, which is useful to solve this:

First of all, we need to convert the T°C to T° K

T° K = T°C + 273 → 27°C + 273 = 300 K

Let's replace the data given: 10 atm . 50L = m . 0.082L.atm/m.K . 300K

500 L.atm / 0.082L.atm/m.K . 300K = m

12.2 moles = n

Answer:

380 mL is the new volume

Explanation:

At constant pressure.

V₁ / T₁ = V₂ / T₂

Temperature must be in Absolute Values (T°K = T°C + 273)

-125°C + 273 = 148 K

31°C + 273 = 304 K

185 mL / 148 K = V₂ / 304 K

V₂ = (185 mL / 148 K) . 304 K → 380 mL

Explanation:

Substances would be most likely to fall to the bottom of the beaker are CrPO4, Pb(OH)2.

All nitrates are soluble in water therefore, LiNO3 will be soluble. Also, sodium potassium salts are always soluble therefore, NaBr, KOH are soluble. Moreover. RbCl are generally soluble therefore, leaving the other two.

The question is incomplete, here is the complete question:

Burning a compound of calcium, carbon, and nitrogen in oxygen in a combustion train generates calcium oxide (CaO), carbon dioxide [tex](CO_2)[/tex], nitrogen dioxide [tex](NO_2)[/tex], and no other substances. A small sample gives 2.389 g CaO, 1.876 g [tex]CO_2[/tex], and 3.921 g [tex]NO_2[/tex] Determine the empirical formula of the compound.

Answer: The empirical formula for the given compound is [tex]CaCN_2[/tex]

Explanation:

The chemical equation for the combustion of compound having calcium, carbon and nitrogen follows:

[tex]Ca_xC_yN_z+O_2\rightarrow CaO+CO_2+NO_2[/tex]

where, 'x', 'y' and 'z' are the subscripts of calcium, carbon and nitrogen respectively.

We are given:

Mass of CaO = 2.389 g

Mass of [tex]CO_2=1.876g[/tex]

Mass of [tex]NO_2=3.921g[/tex]

We know that:

Molar mass of calcium oxide = 56 g/mol

Molar mass of carbon dioxide = 44 g/mol

Molar mass of nitrogen dioxide = 46 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 1.876 g of carbon dioxide, [tex]\frac{12}{44}\times 1.876=0.5116g[/tex] of carbon will be contained.

For calculating the mass of nitrogen:

In 46 g of nitrogen dioxide, 14 g of nitrogen is contained.

So, in 3.921 g of nitrogen dioxide, [tex]\frac{14}{46}\times 3.921=1.193g[/tex] of nitrogen will be contained.

For calculating the mass of calcium:

In 56 g of calcium oxide, 40 g of calcium is contained.

So, in 2.389 g of calcium oxide, [tex]\frac{40}{56}\times 2.389=1.706g[/tex] of calcium will be contained.

To formulate the empirical formula, we need to follow some steps:

Moles of Calcium =[tex]\frac{\text{Given mass of Calcium}}{\text{Molar mass of Calcium}}=\frac{1.706g}{40g/mole}=0.0426moles[/tex]

Moles of Carbon =[tex]\frac{\text{Given mass of Carbon}}{\text{Molar mass of Carbon}}=\frac{0.5116g}{12g/mole}=0.0426moles[/tex]

Moles of Nitrogen = [tex]\frac{\text{Given mass of Nitrogen}}{\text{Molar mass of Nitrogen}}=\frac{1.193g}{14g/mole}=0.0852moles[/tex]

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0426 moles.

For Calcium = [tex]\frac{0.0426}{0.0426}=1[/tex]

For Carbon = [tex]\frac{0.0426}{0.0426}=1[/tex]

For Nitrogen = [tex]\frac{0.0852}{0.0426}=2[/tex]

The ratio of Ca : C : N = 1 : 1 : 2

Hence, the empirical formula for the given compound is [tex]CaCN_2[/tex]

The empirical formula of the compound containing calcium, carbon, and nitrogen is CaC2N.

The empirical formula of a compound can be determined from the ratio of the elements present in the compound. In this case, we need to find the smallest whole-number ratio of calcium, carbon, and nitrogen in the compound. From the given information, we know that there is 1 calcium, 2 carbon, and 1 nitrogen in the compound. To find the empirical formula, divide each count by the smallest count, which is 1 in this case. Therefore, the empirical formula of the compound is CaC2N.

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Answer:

The empirical formula is = [tex]C_4H_8O[/tex]

Explanation:

Mass of water obtained = 9.29 g

Molar mass of water = 18 g/mol

Moles of [tex]H_2O[/tex] = 9.29 g /18 g/mol = 0.51611 moles

2 moles of hydrogen atoms are present in 1 mole of water. So,

Moles of H = 2 x 0.51611 = 1.03222 moles

Molar mass of H atom = 1.008 g/mol

Mass of H in molecule = 1.03222 x 1.008 = 1.0407 g

Mass of carbon dioxide obtained = 22.7 g

Molar mass of carbon dioxide = 44.01 g/mol

Moles of [tex]CO_2[/tex] = 22.7 g  /44.01 g/mol = 0.5158 moles

1 mole of carbon atoms are present in 1 mole of carbon dioxide. So,

Moles of C = 0.5158 moles

Molar mass of C atom = 12.0107 g/mol

Mass of C in molecule = 0.5158 x 12.0107 = 6.1950 g

Given that the compound only contains hydrogen, oxygen and carbon. So,

Mass of O in the sample = Total mass - Mass of C  - Mass of H

Mass of the sample = 9.30 g

Mass of O in sample = 9.30 - 6.1950 - 1.0407 = 2.0643 g  

Molar mass of O = 15.999 g/mol

Moles of O  = 2.0643  / 15.999  = 0.12903 moles

Taking the simplest ratio for H, O and C as:

1.03222 : 0.12903 : 0.5158

= 8 : 1 : 4

The empirical formula is = [tex]C_4H_8O[/tex]

Answer:

275.3 nm is the wavelength of light required for mercury.

Mercury can not be used to generate electricity from the sun because wavelength at which mercury will emit an electron is smaller than 500 nm.

Explanation:

The wavelength of light required for mercury  to emit an electron.

The wavelength of the radiation = [tex]\lambda [/tex]

Energy required fro mercury to to emit an electron = E

Energy required fro mercury to to emit an electron will the energy if the radiation = E' = [tex]7.22\times 10^{-19} J[/tex]

E' = E

To calculate the wavelength of light, we use the equation:

[tex]E=\frac{hc}{\lambda }[/tex]

where,

[tex]\lambda[/tex] = wavelength of the light  

h = Planck's constant = [tex]6.626\times 10^{-34} Js[/tex]

c = speed of light = [tex]3\times 10^8m/s[/tex]

[tex]\lambda =\frac{hc}{E}[/tex]

[tex]=\frac{6.626\times 10^{-34} Js\times 3\times 10^8m/s}{7.22\times 10^{-19} J}[/tex]

[tex]\lambda =2.753\times 10^{-7} m=2.753\times 10^{-7}\times 10^ nm =275.3 nm[/tex]

Wavelength of the sun light in the visible region = 500 nm

500 nm > 275.3 nm

[tex]E\propto \frac{1}{\lambda }[/tex]

Less energy < more energy

So, this means that mercury can not be used to generate electricity from the sun.

The wavelength of light in nm is

[tex]\lambda = \frac{hc}{E}\\\\ \lambda = \frac{6.626*10^{-34} * 3*10^8}{7.22*10^{-19}}\\\\ \lambda = 2.7531856*10^{−7}\\\\ \lambda = 275nm [/tex]

No, the therhold energy is larger than the wavelength of sun, therefore, electricity will not be generated.

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Final answer:

The balanced chemical equation for the formation of magnesium hydroxide and hydrogen from magnesium and water is Mg (s) + 2 H2O (l) → Mg(OH)2 (s) + H2 (g), with several possible mole ratios based on the equation's stoichiometry.

Explanation:

The equation for the formation of magnesium hydroxide and hydrogen gas from magnesium and water is:

Mg (s) + 2 H2O (l) → Mg(OH)2 (s) + H2 (g)

This reaction is balanced as written, with one atom of magnesium reacting with two molecules of water to produce one molecule of magnesium hydroxide and one molecule of hydrogen gas.

The possible mole ratios in this reaction are:

1 mole of Mg to 2 moles of H2O

1 mole of Mg to 1 mole of Mg(OH)2

1 mole of Mg to 1 mole of H2

2 moles of H2O to 1 mole of Mg(OH)2

2 moles of H2O to 1 mole of H2

These mole ratios are derived from the coefficients of each substance in the balanced chemical equation.

Answer:

The atmosphere refers to the gaseous envelope of earth, comprised of variable gases with definite proportions. The layers of the earth's atmosphere are as follows-

This variation in temperature occurs because of the certain reason. In the troposphere and the mesosphere, the temperature decreases with height because the pressure and height are inversely proportional to each other. The stratosphere experiences increasing temperature because of the presence of the ozone layer that is responsible for holding the greenhouse gases and the harmful UV radiation. The thermosphere and the exosphere experience high temperatures because of the receiving of the direct sunlight. Due to these above reason, there occurs this temperature change in a unique pattern.

The temperature changes within the layers of the atmosphere follow a pattern of alternating increases and decreases. This unique pattern is influenced by factors such as sun angle, insolation intensity, day length, and proximity to water bodies.

The pattern of temperature changes within the layers of the atmosphere is characterized by alternating increases and decreases in temperature. This pattern can be observed in the five layers of the atmosphere, namely the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The temperature gradient varies with each layer, with the troposphere being the coldest and the thermosphere being the hottest. The unique pattern of temperature changes is caused by various factors such as sun angle, insolation intensity, day length, and proximity to water bodies.

Answer:

14.0 blocks  

Explanation:

Distance travelled

= 4.0 blocks + 6.0 blocks + 4.0 blocks

= 14.0 blocks

Patrice has travelled 14.0 blocks.

Answer :

(a) The balanced molecular equation will be,

[tex]3KSCN(aq)+Fe(NO_3)_3(aq)\rightarrow Fe(SCN)_3(aq)+3KNO_3(aq)[/tex]

(b) The complete ionic equation in separated aqueous solution will be,

[tex]3K^+(aq)+3SCN^{-}(aq)+Fe^{3+}(aq)+NO_3^{-}(aq)\rightarrow Fe^{3+}(aq)+3SCN^{-}(aq)+3K^+(aq)+3NO_3^-(aq)[/tex]

(c) In this equation the all the species are in aqueous state. So, there is no net ionic form of the reaction.

Explanation :

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a) The balanced molecular equation will be,

[tex]3KSCN(aq)+Fe(NO_3)_3(aq)\rightarrow Fe(SCN)_3(aq)+3KNO_3(aq)[/tex]

(b) The complete ionic equation in separated aqueous solution will be,

[tex]3K^+(aq)+3SCN^{-}(aq)+Fe^{3+}(aq)+NO_3^{-}(aq)\rightarrow Fe^{3+}(aq)+3SCN^{-}(aq)+3K^+(aq)+3NO_3^-(aq)[/tex]

(c) In this equation the all the species are in aqueous state. So, there is no net ionic form of the reaction.

The student's question involves the reaction between Fe(NO₃)₃ and KSCN forming FeSCN²⁺ and KNO₃. This explanation includes the molecular, complete ionic, and net ionic forms of the equation, with further context on the effect of KNO₃ on the reaction equilibrium.

To answer the student's question, we need to write equations for the reaction between aqueous Fe(NO₃)₃ (Iron(III) nitrate) and aqueous KSCN (potassium thiocyanate) to form aqueous FeSCN²⁺ (Iron(III) thiocyanate) and aqueous KNO₃ (potassium nitrate). Here is the breakdown:

Fe(NO₃)₃(aq) + 3 KSCN(aq) → Fe(SCN)₃(aq) + 3 KNO₃(aq)

Fe³⁺(aq) + 3 NO₃⁻(aq) + 3 K⁺(aq) + 3 SCN⁻(aq) → Fe(SCN)₃²⁺(aq) + 3 K⁺(aq) + 3 NO₃⁻(aq)

Fe³⁺(aq) + 3 SCN⁻(aq) → Fe(SCN)₃²⁺(aq)

In this experiment, the presence of Fe(SCN)²⁺ is indicated by a color change, but adding KNO₃, according to Le Chatelier's principle, will shift the equilibrium left, reducing Fe(SCN)²⁺ concentration.

The values of the given combinations are: a) 5, b) 10, c) 70, d) 1, e) 1, f) 924.

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The values of the given combinations are: a) 5, b) 10, c) 70, d) 1, e) 1, f) 924.

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Answer:

E

Explanation:

From the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another. The kind of energy in fuels can be said to be chemical energy. This chemical energy in fuel is good enough to do some work by its conversion process to other forms of energy. It is the end of the last amount of this conversion that brings us to the term that the fuel is exhausted and we need to refuel so as to be able to do more work of conversion.

The chemical energy in fuels is usually converted to heat energy in cylinders which can then be converted to make the vehicle move from one point to another with a continuous conversion of this fuel.

When your car runs out of gas, the energy that was contained in the gas is converted into chemical energy.

The correct answer is A. been converted into chemical energy.

When your car runs out of gas, the energy that was contained in the gas is not destroyed or created, but rather converted into another form of energy, specifically chemical energy. The gasoline undergoes a combustion reaction in the car's engine, releasing energy that is used to propel the vehicle.

This process can be explained by the principle of conservation of energy, which states that energy cannot be created or destroyed, only converted from one form to another.

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Calcium carbonate is most likely to dissolve in water with:

e. Lots of Carbon dioxide and colder temperature.

Explanation:

Calcium carbonate is most likely to dissolve in water that has a lot of carbon dioxide and is colder, as CO2 creates acidic conditions which increase CaCO3 solubility.

Calcium carbonate (CaCO3) is known to be more soluble in water when the conditions are acidic. The presence of carbon dioxide (CO2) in the water greatly inclines the water to be more acidic as CO2 reacts with H2O to form carbonic acid (H2CO3), which further dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3-). This series of reactions results in a decrease in the concentration of carbonate ions, enabling more CaCO3 to dissolve.

Therefore, in accordance with the provided information, calcium carbonate is most likely to dissolve in water with characteristics described in option (e), which is 'lots of carbon dioxide and colder temperatures.' Colder temperatures are more favorable compared to warmer temperatures for the solubility of gas-like CO2, thereby increasing the acidity and aiding in the dissolution of CaCO3.

The formula of the alloy of a bcc unit cell in case of first condition is AB and if positions of atoms are interchanged  then the formula is AB.

Unit cell is defined as the smallest repeating unit of crystal which when repeated leads to the generation of a crystal.They have 6 lattice parameters and seven crystal structures.Accordingly, the number of atoms in unit cells is different.

The number of atoms in each kind of unit cell is different . In case of body-centered cubic unit cell number of atoms per unit cell is 2, while those in simple cubic unit cell is one and that for face centered cubic unit cell is 4.

The concept of unit cell is used in describing the crystal structures, prediction of lattice type can be characterized by the geometry of it's unit cell.

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Final answer:

The formula of the substitutional alloy with element A at the corners and element B at the center of the BCC unit cell is AB; if the positions were reversed, the formula would remain AB because the BCC structure contains one atom from the corners and one from the center.

Explanation:

The formula of a substitutional alloy with element A at the corners and element B at the center of a body-centered cubic (BCC) unit cell is AB. In a BCC unit cell, there are eight corners, each contributing 1/8th of an atom, totaling to one atom of element A, and one full atom of element B at the center. Therefore, the formula for this alloy is AB.

If the positions of the two elements were reversed in the unit cell, with element B at the corners and element A at the center, the concept to calculate the formula remains the same. There would be one full atom of element B from the corners (8 corners*1/8th of an atom) and one full atom of element A from the center. Consequently, the formula of the alloy with reversed positions would also be AB.

Answer:

No.

Explanation:

The results mentioned are not consistent with the law of definite proportions.

Law of definite proportions states that a chemical compound contains exactly the same elements in the same proportion by weight independent of its source and method of it's preparation.

In the given question, the first sample contains 38.9 g of carbon and 451 g of chlorine that means the sample has 8% of carbon and 92% of chlorine.

On the other hand, second sample contains 14.8 g of carbon and 135 g of chlorine which means that this sample has 10% of carbon and 90% of chlorine.

Since the constituent elements in both the samples are not in fixed and constant proportions (by mass), the law of definite proportions fails here.

Answer :

(a) Orange juice  → Heterogeneous mixture

(b) Tap water  → Homogeneous mixture

Explanation:

Homogeneous mixture:

It is a type of mixture in which the components of the mixture are distributed uniformly throughout the mixture.

It can not be separated by physically. It has only one phase.

Heterogeneous mixture:

It is a type of mixture in which all the components are completely mixed and the particles present in the mixture can be separated by physically.

They have two or more phase.

From the given options, tap water is a homogeneous mixture because it has only one phase.

While the other options, orange juice are heterogeneous mixture because it can be separated by physically and they have two or more phase.

Tap water is a homogeneous mixture because its composition is uniformly distributed and it appears as one substance. Orange juice, especially if it contains pulp, is a heterogeneous mixture since its components (pulp and liquid) are distinct and not uniformly mixed.

The substances in question, orange juice and tap water, can be classified as either homogeneous or heterogeneous mixtures. In a homogeneous mixture, the components are evenly mixed throughout and you can't see the different parts. Tap water is an example of this because it usually contains many different substances dissolved inside it like minerals, and gasses, but it still retains the same properties throughout, meaning it looks like one substance.

On the other hand, a heterogeneous mixture contains components that aren't evenly mixed and you can see the different parts. Orange juice, especially if it's freshly squeezed and contains pulp, is an example of a heterogeneous mixture. The pulp and liquid are very different in terms of texture and appearance and they don't blend into a single, indistinguishable mixture.

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The gears on a bicycle are an example of the wheel and axle type of simple machine, which includes a rod (axle) attached to the center of a wheel to amplify force or speed, and combines with levers and pulleys in the full mechanism of the bicycle.

The gears on a bicycle are an example of the wheel and axle type of simple machine. This particular type of simple machine consists of a rod (the axle) fixed to the center of a wheel, which together can amplify force or speed. Though similar to a lever, the wheel and axle design allows for continuous rotational motion, which is ideal for bicycles. According to renaissance scientists, there are six classifications of simple machines, which are the lever, wheel and axle, pulley, inclined plane, wedge, and screw. Bicycles actually combine several types of simple machines, including wheel and axles, levers, and in some cases, pulleys.

Answer:

The corect answer is c) naturally occurring; solids

Explanation:

Minerals exists as solid substances in nature consisting of one or more element chemically combined together formiming compounds with definite composition. As mentioned earlier single elements can form minerals and  examples of single element mineral are Silver, Carbon and Gold which are found in nature in their pure form and are mined.

Minerals are normally found in rocks, which may contain one ore more different types of minerals

Answer:

Moles of Carbon in the product = 0.183 mol

Explanation:

Complete combustion of an organic compound in the presence of excess oxygen will give carbon dioxide (CO2) and water vapour(H2O).

Equation of reaction

CxHyOz(s) + (2x + y/2 - z)/2 O2(g) --> x CO2(g) + y/2 H2O(l)

Moles of products

CO2

Molar mass of CO2 = 12 + (16*2)

= 44 g/mol

n(CO2) = 8.07/44.0

= 0.183 mol

One compound of CO2 has 1 Carbon atom and 2 Oxygen atom.

So if we have,

0.183 moles of carbon dioxide then

0.183 moles of carbon.

The mass of carbon in the product, m = 0.183*12

= 2.20 g

H2O:

Molar mass of H2O = (1*2) + 16

= 18 g/mol

Number of moles of H2O =

= 3.3/18

= 0.183 mol

One compound of H2O has 2 Hydrogen atom and 1 Oxygen atom.

0.183 moles of water then we also have

= 2*(0.183)

= 0.367 moles of hydrogen in the sample.

The mass of hydrogen in the compound, m

= 0.367*1

= 0.367 g

Adding these two values together will give us the mass of our compound that C and H;

2.2 + 0.367

= 2.567 g

So for the Oxygen,

5.5 g - 2.567

= 2.933 g

Moles of Oxygen;

Molar mass of O = 16 g/mol

= 2.933/16

= 0.183 mol

There are 0.030 moles of carbon  in the original sample as per the mole concept.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is given by the formula,

[tex]\rm{number \ of \ moles}=\dfrac{\rm{mass}}{molar \ mass}[/tex]

The given values are,mass=[tex]5.50 \ g[/tex]

molar mass=[tex]178g/mol[/tex]

Substitution of values in formula gives,

[tex]\rm{number \ of \ moles}=\dfrac{5.50}{178}\\=0.030[/tex]

Thus, there are 0.030 moles of carbon  in the original sample as per the mole concept.

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Answer:

C3H6

Explanation:

We can obtain the molecular formula by using the empirical formula and the molar mass in combination.

This is shown below:

[CH2]n = 42g/mol

We then add the atomic masses of carbon and hydrogen and multiply by n to give the value of n .

n[12 + 2(1)] = 42

14n = 42

n = 42/14 = 3

The molecular formula is thus [CH2]3 = C3H6

Answer:

C3H6

Explanation:

42g/mol=molar mass

14g/mol= emperical mass

42/14=3

3 times emperical

Answer:0.026ml

Explanation:

Details are found in the image attached. We must subtract the saturated vapour pressure of hydrogen gas at the given temperature from the total pressure of the hydrogen gas collected over water to obtain the actual pressure of hydrogen gas and substitute the value obtained into the general gas equation. The dry hydrogen gas has no saturated vapour pressure hence the value is substituted as given. All temperatures must be converted to Kelvin before substitution.

Answer:

Explanation:

from Bohr's equation,

E = -Z²R/n²

R = 13.6 eV

Z = atomic number of element

for 1s energy level n= 1

E = -(Z)² x (13.6)/(1)²

E = -13.6Z²

calculating the numerical for the 1s energy levels for He+ and Li2+

- for He+

E = -13.6 * (2)² = -54.4eV

- for Li2+

E = -13.6 * (3)² = -122.4eV

Answer:

Molarity for the solution is 0.44 mol/L

Explanation:

Let's analyse the data:

0.448 m means molality (mol of solute in 1kg of solvent)

Density = mass / volume and it always refers to solution

The molar mass of the solute, can help us to determine the mass of solute.

For molarity we need the volume of solution; remember that Molarity means the moles of solute in 1L of solution

1kg = 1000 g

Let's determine the mass of solute

0.448 mol . 194.2 g/ mol = 87 g of solute

So we have 87 g of solute and 1000 g of solvent

Mass of solution = Mass of solute + Mass of solvent

Mass of solution = 87 g + 1000 g → 1087 g

Now we can apply density for the volume

1.063 g/mL = 1087 g / Solution volume

Solution volume = 1087 g / 1.063 g/mL →1022.5 mL

Finally we must convert the volume from mL to L

1022.5 mL . 1L / 1000 mL = 1.0225 L

Molarity (mol/L) = 0.448 mol / 1.0225L → 0.44 M

Explanation:

The above statement is incorrect. The luster in minerals is not because of the their ability to transmit light but the ability to reflect light from their surface. More, the clean or polished the surface would be more light they would reflect.

Moreover, opaque minerals do not transmit light, they reflect it back into our eyes that is why we can see them. So, this correct.

Answer: nonmetallic; do not transmit

Explanation:

Answer:

Arrange the listed ions in increasing order of strength of reducing agent.

Aluminum: 6

Cobalt: 4

Copper: 3

Chromium: 5

Mercury: 1

Silver: 2

Answer: 6, 4, 3 , 5 , 1 , 2

Aluminum: 6

Cobalt: 4

Copper: 3

Chromium: 5

Mercury: 1

Silver: 2

Explanation:

Answer:

Correct answer is (D). as a weak acid it can cross the membrane when in its uncharged form.

Explanation:

Aspirin (acetylsalicylic acid, ASA) is an analgesic and anti-inflammatory agent use in the treatment of gentle to moderate pain, inflammation and fever. It is absorb in the stomach and intestine in an unchanged form.