What is the mass(g) of 9.00 moles of water?

The number of protons in an isotope of an element is determined by its atomic number. The element Chromium (Cr) has an atomic number of 24, so all its isotopes, including Cr-50, Cr-52, Cr-53, and Cr-54, contain 24 protons.

The element symbol Cr represents the element Chromium. The number of protons in any isotope of an element is determined by the atomic number, not the isotope number. Chromium has an atomic number of 24, so all isotopes of Chromium, including Cr-50, Cr-52, Cr-53, and Cr-54, contain 24 protons.

The number of protons in an isotope of an element is determined by its atomic number. The element Chromium (Cr) has an atomic number of 24, so all its isotopes, including Cr-50, Cr-52, Cr-53, and Cr-54, contain 24 protons.

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The wavelength of the light emitted is 5 x [tex]10^{-3}[/tex] nm

Explanation:

The wavelength of light from an LED with a frequency of 60 Hz is not in the visible spectrum and would be extremely long, measuring 5 x 10^15 nm, which falls within the range of radio waves.

To determine the wavelength of light emitted by an LED lightbulb with a frequency of 60 Hz, we must use the relationship between the speed of light, frequency, and wavelength. The equation we use is c = λν, where c is the speed of light in vacuum (approximately 3 × 108 m/s), λ is the wavelength, and ν is the frequency. However, a frequency of 60 Hz would result in a wave that is not within the visible light spectrum but rather in the range of radio waves, and its wavelength would be extremely long compared to visible light wavelengths measured in nanometers.

To calculate the wavelength in meters, we divide the speed of light by the frequency:

λ = c / ν

λ = (3 × 108 m/s) / (60 Hz)

λ = 5 × 106 m

To convert this to nanometers (nm), knowing that 1 m = 109 nm, we multiply by 109:

λ = 5 × 106 m × 109 nm/m

λ = 5 × 1015 nm

This wavelength is much larger than the wavelengths for light in the visible spectrum, which are typically between 380 nm and 750 nm. Consequently, the wavelength of 60 Hz frequency light cannot be represented in nanometers as it falls outside the visible range.

Explanation:

This given reaction is a chemical reaction that is : Double decomposition reaction .

In this reaction , there is a reaction between two compounds in which they mutually interchange their ions .

That is :

AB +CD ---> AC +BD

Similarly in this we have :

Na3PO4+KOH—->NaOH + K3PO4

The double decomposition reaction is either :

Precipitation reaction : resulst in the formation of ppt .

Neutralization reaction : results in the formation of neutral substance

Answer:

mol H2S = 1.28 mol

Explanation:

balanced reaction:

∴ moles HCl = 2.56 mol

⇒ moles H2S = ?

⇒ moles H2S = (2.56 mol HCl)*(mol H2S/2 moles HCl)

⇒ moles H2S = 1.28 mol

Answer:

12.371

Explanation:

pH of a 0.0235 M HCl solution is;

pH = -log[H+ ] = -log(0.0235) = 1.629

pOH = 14.000 – pH = 14.000 – 1.629 = 12.371

Taking into account the definition of pH and pOH, the pOH of a 0.0235 M HCl solution is 12.37.

In first place, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically, pH is expressed as the negative base 10 logarithm of the hydrogen ion concentration:

pH= - log [H⁺]= -log [H₃O⁺]

A strong acid is an acid that ionizes almost completely in aqueous solution, so the concentration of protons equals the concentration of the acid.

Being HCl a strong acid, then

[HCl]= [H⁺]= [H₂O⁺]= 0.0235 M

Then, the pH of the solution is:

pH= -log (0.0235 M)

pH= 1.63

On the other hand, pOH is a measure of the concentration of hydroxyl ions in a solution. The following relationship can be established between pH and pOH:

pH+ pOH= 14

In this case:

1.63 + pOH= 14

Solving:

pOH= 14 - 1.63

pOH= 12.37

Finally, the pOH of a 0.0235 M HCl solution is 12.37.

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Answer:

metals? I'm not 100% sure, sorry if I'm wrong.

Answer:

n=N/Na

----. N=nxNa=3x6.023x10^23=1.8069e+24

Answer:

It stays àt 80j

Explanation:

The total energy of the isolated system remains 80 J as the gravitational potential energy is converted into kinetic energy in a frictionless environment, maintaining conservation of energy.

As the box slides down the frictionless slide, the total energy of the system remains constant due to the conservation of energy principle. The initial 80 J of gravitational potential energy is progressively converted into kinetic energy as the box moves down the slide. Since the slide is frictionless, there are no dissipative forces like friction to convert mechanical energy into heat. Hence, the isolated system, which includes the box, slide, and earth, will still store 80 J of total energy, but in different forms (mostly kinetic energy when the box is at the bottom of the slide).

Answer:

pumice and gneiss

Explanation:

both are formed by conduction of energy

Answer: m= 1.02x10² g AlCl3 or 1091.3 g AlCl3

Explanation: solution attached.

Convert mass of Mg to moles

Do the mole ratio between Mg and AlCl3 based from the balanced equation.

Convert moles of AlCl3 to mass using its molar mass.

Answer:

1.0511458x10^22

Explanation:

0.633 mol/ 1 x 6.022x10^23/1 mol

Answer:

B. (Linear graph with positive slope)

Explanation:

The picture above showing that  

1. T2 is higher than T1

2. V2 is higher than V2

From this, we can conclude that the relationship for temperature (T) and volume(V) is positive. That means a higher temperature will result in a higher volume.  

Since the relationship positive, the graph will have a positive slope. We can't prove if the graph should be linear or exponential since we don't have the exact number of the experiment.

Answer:

B.

Explanation:

Answer:

                    49.52 g of H₂O

Explanation:

                    The balance chemical equation for given reaction is as follow;

                                  4 HCl + O₂ → 2 H₂O + 2 Cl₂

Step 1: Find out Limiting reagent as;

According to balance equation,

                    4 moles of HCl reacted with  =  1 mole of O₂

So,

                5.50 moles of HCl will react with  =  X moles of O₂

Solving for X,

                     X =  5.50 mol × 1 mol / 4 mol

                     X =  1.375 moles of O₂

This means to completely consume 5.5 moles of HCl we will need 1.375 moles of O₂ while, we are provided with 3.0 moles of O₂ which is in excess hence, the limiting reagent in this problem is HCl and it will control the yield of products.

Step 2: Calculate Moles of H₂O produced;

According to balance equation,

                    4 moles of HCl produced  =  2 moles of H₂O

So,

                5.50 moles of HCl will react with  =  X moles of H₂O

Solving for X,

                     X =  5.50 mol × 2 mol / 4 mol

                     X =  2.75 moles of H₂O

Step 3: Calculate Mass of H₂O as;

                Mass  =  Moles × M.Mass

                Mass  =  2.75 mol × 18.01 g/mol

                Mass =  49.52 g of H₂O

Answer:

Lead (/ˈlɛd/) is a chemical element with the symbol Pb

Answer: m= 58.8 g Kr

Explanation: solution attached:

Find first the number of moles for Kr.

Use Ideal gas law formula PV= nRT and derive for n.

Convert moles to mass using the molar mass of Kr.

Answer: A

both permanent magnet and electromagnets.

i hope that helps

Final answer:

A permanent magnet can affect both other permanent magnets and electromagnets, as well as metals such as iron and nickel. It cannot attract non-metals like plastic or wood and can also exert a force on charged particles when they are in motion.

Explanation:

The question concerns the effects a permanent magnet can have on various objects and fields, particularly addressing what a permanent magnet can affect. A permanent magnet can affect both other permanent magnets and electromagnets by exerting a magnetic force on them. Magnets can also affect objects made of materials that are attracted to magnets, such as iron and nickel. These materials are typically metals, not non-metals like plastic or wood, which do not respond to magnetic fields.

Furthermore, a magnetic field can exert a force on charged particles, such as electrons, when they are in motion. This is a fundamental principle of electromagnetism, a branch of physics that studies the interaction between electricity and magnetism. Consequently, the correct answer to the question is that a permanent magnet can affect both permanent magnets and electromagnets.

Answer:

There are several ways to know if a chemical change has occurred. The following is an indication that a chemical change has occurred

1. Change of composition - wood turning to ash when burned.

2. Change of color - For example, during titration, we know that the reaction has occurred by a change in colour from orange to pink when we used methyl orange as indicator., rusting of iron.

3. Change in temperature or energy, such as the production (exothermic or loss endothermic) of heat.

4. The decomposition of organic matter for example, the decay of dead plant or animal

5. Light and/or heat given off: For example, potassium react explosively with water releasing a large amount of heat

6. When the change is difficult to reverse. For example, after burning wood to produce ash, we can not get back the wood again.

"An advertisement for a commercial hand warmer claims that the hand warmer works because a chemical reaction in the hand warmer draws out the body’s own natural heat causing a warming effect"

Explanation:

Hand warmer

        A) Crystalline type

        B) Air activated

        C) Lighter

        D) Battery

        E) Charcoal

Answer:

false

Explanation:

Ethyne is prepared by using water and calcium carbide in the laboratory.

Explanation:

Acetylene is conveniently prepared in the laboratory by the action of water(H₂O) on calcium carbide (CaC₂). Calcium carbide in turn is obtained by heating the mixture of coke and lime stone in an electric furnace.

CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂

Ethyne gas prepared in the lab using the above method may contain impurities like H₂S, PH₃, AsH₃, NH₃etc. The gas is purified by bubbling it through acidified copper sulfate solution.

Answer:

moles of H2O = 4.5 mol

Explanation:

balanced equation:

∴ mass SnO2 = 339 g

∴ molar mass SnO2 = 150.71 g/mol

⇒ moles SnO2 = (339 g)(mol/150.71 g) = 2.25 mol SnO2

⇒ moles H2O = (2.25 mol SnO2)(2 mol H2O/mol SnO2)

⇒ moles H2O = 4.5 mol H2O

Answer:

3.95 oz

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

Apple iPhone = 112 g

Step 2: Identify Conversions

1 lb = 454 g

1 lb = 16 oz

Step 3: Convert

[tex]112 \ g(\frac{1 \ lb}{454 \ g} )(\frac{16 \ oz}{1 \ lb} )[/tex] = 3.94714 oz

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

3.94714 oz ≈ 3.95 oz

Final answer:

The weight of an Apple iPhone can be calculated by converting the mass from grams to pounds and then from pounds to ounces which results in approximately 3.94 ounces.

Explanation:

To find the weight of an Apple iPhone in ounces, we can use the conversion factors provided. Given that 1 pound (lb) is equal to 16 ounces (oz) and 1 pound (lb) is equivalent to 454 grams (g), we can convert the mass of the iPhone from grams to pounds and then from pounds to ounces.

First, convert the mass of the iPhone from grams to pounds:

112 g ÷ 454 g/lb = 0.246 lb

Next, convert the mass in pounds to ounces:

0.246 lb × 16 oz/lb = 3.9376 oz

Therefore, the weight of the Apple iPhone is approximately 3.94 ounces.

The human use of coal impacts air and water quality significantly. The burning of coal results in air pollution, contributing to global health and environmental issues. Additionally, processes related to coal use also contaminate local water bodies, damaging aquatic ecosystems and affecting the safety of drinking water.

The human use of coal has significant impacts on both air and water quality. When coal is burned for energy, it releases pollutants, including sulfur dioxide and nitrogen oxides into the atmosphere. These substances can lead to air pollution, contributing to issues like acid rain, smog, respiratory diseases, and global warming.

Coal mining and combustion also affect water quality. Acid mine drainage, where water in coal mines becomes acidic and leaks out, can contaminate local water bodies, harming aquatic life and making the water unsafe for human consumption. Moreover, coal-fired power plants often discharge waste materials containing heavy metals like mercury into water bodies, further deteriorating water quality.

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Answer:

Water

Explanation:

one molecule of water has two hydrogen atoms covalently bonded to a single oxygen atom. Water is a tasteless, odorless liquid at ambient temperature and pressure. Which is known to be crystal blue.

Answer:

well I t could be in liquid form or in air form

Explanation:

Answer:

Square root { 2g * Delta-y * /m}

Explanation:

it is as shown in the attached file.

Note that the expression "2gΔy" with the square root can be represented as: [tex]\[2g\sqrt{\Delta y}\][/tex]

The expression [tex]\[2g\sqrt{\Delta y}\][/tex] represents a mathematical formula involving the square root of the change [tex](\Delta)[/tex] in the variable y. Here:

- 2 is a constant multiplier,

- g is a constant (possibly representing the acceleration due to gravity),

-  [tex]\sqrt{\Delta y}[/tex] denotes the square root of the change in y.

It is a concise way to express a quantity that involves a constant, the square root, and a change in a variable. The specific interpretation would depend on the context of the problem or equation in which it appears.

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The increase in pressure will result in the decrease of the total number of gas molecules due to the shift in equilibrium toward the side with fewer moles of gas, following Le Châtelier's principle.

According to Le Châtelier's principle, how will a pressure increase affect a system that includes matter in the gas phase and another phase? The correct answer is D. The total number of gas molecules will decrease. This is because Le Châtelier's principle states that a pressure increase will shift an equilibrium toward the side of the reaction with the fewer number of moles of gas, as this helps to counteract the change by reducing the pressure within the system. This principle is particularly useful when predicting how a change in pressure will affect the position of equilibrium in a chemical reaction involving gases.

Final answer:

Le Châtelier's principle indicates that increased pressure in a gaseous reaction shifts equilibrium toward the side with fewer gas molecules to reduce the stress caused by the pressure increase.

Explanation:

According to Le Châtelier's principle, a pressure increase in a system involving gases will cause a shift in equilibrium towards the phase with the fewer number of gas molecules. In the case of a reaction with different numbers of gas molecules on each side of the reaction, such as 2NO(g) + O₂(g) ⇒ 2NO₂(g), an increase in pressure would shift the equilibrium towards the formation of NO₂, since it has fewer gas molecules (2) compared to the reactants (3). This phenomenon occurs because the system responds to reduce the pressure by favoring the production of fewer molecules that would occupy less volume.

Answer:

MgCl2

Explanation:

Lattice energy will be higher on ion with higher charge, or smaller size. A higher charge means it will have a stronger force. Smaller size ion will have less distance.  

Magnesium has +2 charge and located in the third row, make it strongest of these three. Natrium will be the second strongest even though its charge is +1, the same as Kalium. Natrium has smaller size as it is on the third row, compared to Kalium that was in the fourth row.

MgCl2 would have the most negative lattice energy due to the higher charge of Mg²⁺ and its smaller ionic radius.

Lattice energy refers to the energy required to separate one mole of an ionic compound into its gaseous ions. It is determined by the charges and sizes of the ions involved. The more negative the lattice energy, the stronger the ionic bond.

The most negative lattice energy among NaCl, KCl, and MgCl2 is found in MgCl2. This is due to the higher charge of Mg²⁺ compared to Na⁺ and K⁺, as well as its smaller ionic radius. These factors result in stronger electrostatic attractions between the ions, leading to a more negative lattice energy.

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Answer:

             The structure of Ethambutol is attached below. As it can be seen in structure that there are three different atoms which can act as a central atom and hence, can make a geometrical shape. These three atoms are;

(i) Carbon (Tetrahedral):

                Each carbon atom in this compound is Sp³ hybridized because there is no double or triple bond in this compound. So, according to VSEPR theory the four bonded atoms will keep a maximum distance from each other to experience less repulsion. Therefore, the bond angle about carbon atom will be 109.5° and the shape will be Tetrahedral.

(ii) Nitrogen (Trigonal Pyramidal):

                 There are two atoms of Nitrogen in this compound. These Nitrogen atoms are bonded to three atoms. Also, it has one lone pair of electron. This pair of electron will cause the the bond between the atoms to decrease due to more repulsion hence making the bond angle less than 109.5° and giving a Trigonal Pyramidal shape.

(iii) Oxygen (Bent / Angular):

                 The two oxygen atoms are bonded to two atoms and contain two lone pair of electrons, hence, more repulsion and more small angle i.e. 104° giving a bent or angular shape.

Answer: 3.25x10²⁴ atoms Zn

Explanation: Convert moles of Zn to atoms using Avogadro's number

5.4 moles Zn x 6.022x10²³ atoms Zn/ 1 mole Zn

= 3.25x10²⁴ atoms Zn

Answer:

option a is answer

Explanation:

suppose we take an example of sodium chloride is always used in medicines

Answer:it’s b

Explanation: trust meh Brodie