A chunk of an unidentified element (let's call it element "X") is reacted with sulfur to form an ionic compound with the chemical formula X2S. Which of the following elements is the most likely identity of X?a. Mgb. Lic. Ald. Ce. Cl

Answer:

The recovery of pure caffeine is 67.3% of the original, crude sample.

Explanation:

Step 1: Data given

Mass of pure caffeine = 1.69 grams

Original mass of sample = 2.51 grams

Step 2: What is the percent recovery of pure caffeine from crude?

Percentage = (mass of recovery / original mass) *100%

Percentage = (1.69 grams/2.51 grams) *100%

Percentage = 67.3 %

The recovery of pure caffeine is 67.3% of the original, crude sample.

Answer: The volume of acid and water that must be mixed will be 4.8 L and 11.2 L

Explanation:

We are given:

Volume of mixture = 16 L

Percent of acid present = 30 %

Calculating the percentage of acid present in the mixture:

[tex]\Rightarrow 16\times \frac{30}{100}=4.8L[/tex]

The mixture is made entirely of acid and water.

Volume of acid in the mixture = 4.8 L

Volume of water in the mixture = 16 - 4.8 = 11.2 L

Hence, the volume of acid and water that must be mixed will be 4.8 L and 11.2 L

Final answer:

The chemist needs 4.8 liters of pure acid and 11.2 liters of water to prepare 16 liters of a solution that is 30% acid.

Explanation:

To prepare 16 liters of a solution that is 30% acid, we start by setting up an equation to represent the mix of pure acid and water. Let the amount of pure acid needed be x liters, and therefore the amount of water would be 16 - x liters. Since the solution is 30% acid, we can write the equation as follows:

0.30 × 16 = x

When we solve for x, we get:

4.8 = x

This means we need 4.8 liters of pure acid and 16 - 4.8 = 11.2 liters of water to make the 30% acid solution.

Answer:

Hydrophobic amino cluster on the inside of the 3-D structure of the folded protein

Explanation:

Hydrophobic interactions, describe the process in which nonpolar, hydrophobic amino acids cluster or aggregate together in the internal part of the protein, to allow the hydrophilic amino acids interact with surrounding water molecules on the outside.

Answer:

phospholipids

Explanation:

As regards the lipid membrane of the first protocells, it is most likely that it initially consisted of simpler fatty acids than the phospholipids that make up the current membranes (see appendix). If the modern membranes are bilayers of glycerol phospholipids, the primitive membranes would probably be made up of simpler, single-chain molecules, also amphiphilic in nature (with a soluble part and another insoluble in water), such as monocarboxylic acids or alcohols. The origin of these compounds could be multiple. On the one hand, it has been seen that they are very abundant in meteorites of the type of carbonaceous chondrites, so they could have arrived on Earth already formed from outer space. But it is also possible that they were formed abioticly on the primitive Earth by the reaction of CO and hydrogen to give rise to various hydrocarbons, a reaction that would be viable at high temperatures in the presence of ferric catalysts, on the surface of montmorillonite clays and also in hydrothermal conditions. Regardless of the origin, the result would be the presence of fatty acids initially very diluted in an aqueous solution, but which would be concentrated by successive evaporation cycles, or by the formation of small aerosolized drops that would also transfer those vesicles to points distant from the place where The first organic membrane compounds that formed on Earth were formed and would be.

Answer:

The answer is C. An electrochemical cell.

Explanation:

The aluminum ion react with the sulfide to form aluminum sulfide.

Answer: lead(II) chloride PbCl2

Explanation:

Pb(NO3)2 + 2KCl —> PbCl2 + 2KNO3

Taking into account the definition of net ionic equation, a precipitate of PbCl₂ is formed when an aqueous solution of lead(II) nitrate (Pb(NO₃)₂) is mixed with an aqueous solution of potassium chloride (KCl) .

The net ionic equation is a chemical equation for a reaction that lists only the species that participate in the reaction.

In other words, an ionic equation is a chemical equation where electrolytes in aqueous solution are written as dissociated ions.  

In this case, the balanced equation will be:

Pb(NO₃)₂ (aq) + 2 HCl (aq) → PbCl₂ (s) + 2 HNO₃ (aq)

where (aq) means aqueous and (s) solid.

Taking into account that:

The total ionic equation in separated aqueous solution will be:

Pb²⁺(aq) + 2 NO₃⁻(aq) + 2 H⁺ (aq) + 2 Cl⁻ (aq) → PbCl₂ (s) + 2 H⁺ (aq) + 2 NO₃⁻ (aq)

A spectator ion is an ion that appears both as a reactant and as a product in an ionic equation.

Spectator ions can be either cations (positively charged ions) or anions (negatively charged ions).

When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.

In this case, H⁺ and NO₃⁻ are the spectator ions because they appear unchanged in both the product and the reagent. So these ions cancel out by writing the net ionic equation and you get:

Pb²⁺(aq) + 2 Cl⁻ (aq) → PbCl₂ (s)

Since PbCl₂ is an insoluble salt, it will precipitate.

Finally, a precipitate of PbCl₂ is formed when an aqueous solution of lead(II) nitrate (Pb(NO₃)₂) is mixed with an aqueous solution of potassium chloride (KCl) .

Learn more:

Answer:

Q = 1267720 J

Explanation:

∴ QH2O = mCpΔT

∴ m H2O = 500 g

∴ Cp H2O = 4.186 J/g°C = 4.183 E-3 KJ/g°C

∴ ΔT = 120 - 50 = 70°C

⇒ QH2O = (500 g)(4.183 E-3 KJ/g°C)(70°C) = 146.51 KJ

∴ ΔHv H2O = 40.7 KJ/mol

moles H2O:

∴ mm H2O = 18.015 g/mol

⇒ moles H2O = (500 g)(mol/18.015 g) = 27.548 mol H2O

⇒ ΔHv H2O = (40.7 KJ/mol)(27.548 mol) = 1121.21 KJ

⇒ Qt = 146.51 KJ + 1121.21 KJ = 1267.72 KJ = 1267720 J

Answer:

0.089

Explanation:

Step 1:

The balanced equation for the reaction is given below:

H2O + Cl2O <=> 2HClO

Step 2:

Data obtained from the question. This includes:

Concentration of H2O, [H2O] = 0.077 M

Concentration of Cl2O, [Cl2O] = 0.077 M

Concentration of HClO, [HClO] = 0.023 M

Equilibrium constant, K =?

Step 3:

Determination of the equilibrium constant. This is illustrated below:

The equilibrium constant for the above reaction is given below:

K = [HClO]^2 / [H2O] [Cl2O]

K = (0.023)^2 / (0.077 x 0.077)

K = 0.089

Therefore, the equilibrium constant for the above reaction is 0.089

Answer:

The answer is 0.089

I just took the test

Explanation:

Consider the reaction.

Upper H subscript 2 upper o (g) plus upper C l subscript 2 upper O (g) double-headed arrow 2 upper H upper C l upper O (g).

At equilibrium, the concentrations of the different species are as follows.

[H2O] = 0.077 M

[Cl2O] = 0.077 M

[HClO] = 0.023 M

What is the equilibrium constant for the reaction at this temperature?

0.089

0.26

3.9

11

Answer:

grams of lithium bromide produced = 36.2642309286  ≈ 36.30 g

Explanation:

The equation of the reaction is as follows ;

Lithium hydroxide + hydrogen bromide → Lithium Bromide + water

LiOH + HBr → LiBr + H2O

The equation is already balanced

Molecular mass of LiOH = 6.941  + 15.999 + 1.00784

Molecular mass of LiOH = 23.94784  g

Molecular mass of LiBr = 6.941 + 79.904 = 86.845  g

From the equation

LiOH + HBr → LiBr + H2O

23.94784  g of lithium hydroxide produces 86.845  g of lithium bromide

10 g of lithium hydroxide will produce ?

cross multiply

grams of lithium bromide produced = 10 × 86.845/23.94784

grams of lithium bromide produced = 868.45/23.94784

grams of lithium bromide produced = 36.2642309286  ≈ 36.30 g

Answer:

Ionic solid

Explanation:

Ionic solids -

These are the type of solids , which is composed of ions , which are bond by very strong electrostatic force of attraction , are referred to as ionic solids.

And due to very strong force of attraction between the ions , they generally have very high melting point.

When the solid is dissolved in water , the ions gets separate out , and these free ions are capable to conduct electricity , and hence they are very good conductor in molten form , and are insulator in solid form.

Hence , from the given information of the question ,

The correct term is ionic solids.

Answer: 14.3 atm

Explanation: solution attached

The pressure of hydrogen gas in the tank is approximately 4.92 atm.

To find the pressure of the hydrogen gas, we need to use the ideal gas law equation: PV = nRT. Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

To convert the temperature from Celsius to Kelvin, we add 273 to the given temperature. Now, let's plug in the values: P(22.9 L) = (14.0 mol)(0.0821 L·atm/mol·K)(12°C + 273). Solving this equation for P, the pressure of the gas is approximately 4.92 atm.

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Answer:

187.5 mL

Explanation:

From the question we are given;

We are required to determine the new volume of the gas;

We are going to use Boyle's law of gases.

[tex]P\alpha\frac{1}{V}[/tex]

[tex]P=\frac{k}{V}[/tex]

At different pressures and volume with constant temperature, then

[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]

Rearranging the formula;

[tex]V_{2}=\frac{P_{1}V_{1}}{P_{2}}[/tex]

Thus;

[tex]V_{2}=\frac{(500mL)(1.5 atm)}{4.0 atm}[/tex]

    [tex]=187.5 mL[/tex]

Thus, the new volume of the gas is 187.5 mL

Answer:

1.5x500

————-

4.0

Explanation:

Answer:

The answer is B. It contains more non-penetrating solute particles than the interior of the cell.

Explanation:

This means that it has a greater concentration or number of solute particles outside a membrane than there are inside it.

A typical example is Saline solution.

In a hypertonic solution, the extracellular fluid has a higher concentration of solutes than the cell's cytoplasm. Water will leave the cell, causing it to shrink.

A hypertonic solution is any external solution that has a high solute concentration and low water concentration compared to body fluids. In a hypertonic solution, the net movement of water will be out of the body and into the solution.

This means that the solution contains more nonpenetrating solute particles than the interior of the cell. As a result, water will leave the cell, causing it to shrink.

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Answer:

"The same amount of energy" is the combustion of the same amount of palmitic acid in our body to yield.

Explanation:

A bomb calorimeter is an apparatus used to measure the amount of heat out or fascinated by a chemical reaction. This apparatus is airtight and has thermal insulation, which means that the organization doesn't alteration heat with the environments. So, by the variance of the temperature measured on the system (ΔT), the mass of a solution (m) and the specific heat of water (c) it's likely to compute the heat in a reaction that happens in aqueous solution, by the equation below:

                                           Q = [tex]m \times c\times \delta T[/tex]

The heat, or the energy, of the response doesn't depend on where the response is happening, so the sum of energy measured on the bomb calorimeter will be the same in our body.

Answer:

The coefficient of friction of the surface μ = 0.235

Explanation:

Values of the given variables:

Weight of block = 8.5 N

Pushing force F = 2 N

velocity = constant

Solution:

Newton's Second Law of motion states that acceleration of an object depends on the mass of the object and the force applied

F = m a

Since v =constant, a = 0. Thus

Net force Fnet = 0.

Now F_net is the sum of the pushing force and the frictional force along the horizontal, which opposes the motion:

Fnet = Fpushing - Ffrictional_force

Given that Fnet = 0, Fpushing = Ffrictional_force. and Ffrictional_force = 2 N

Equation of friction is given by

Ffrictional_force = μ*W

2 = μ*8.5

μ = 2/8.5 = 0.235

The coefficient of friction for the surface is approximately 0.235.

The coefficient of friction can be determined using the equation:

Given that the weight of the block is 8.5 N, and the force required to push it at constant velocity is 2 N, we can determine the normal force as follows:

Substituting the values into the equation:

Solving for the coefficient of friction:

Therefore, The coefficient of friction for the surface is approximately 0.235.

Final answer:

An exothermic dissolution process suggests that A-B attractive forces are significant enough to overcome A-A and B-B intermolecular forces, resulting in energy being released as heat.

Explanation:

When a solution is made by dissolving solute B in solvent A and the solution process is exothermic, it indicates that the energy released in forming A-B attractive forces is greater than the energy required to overcome both A-A and B-B attractive forces. Since the process is exothermic, this means that the solute-solvent attractions are strong enough to not only break the solute-solute and solvent-solvent interactions but also provide excess energy that is released as heat. If the energy required to separate the solute and solvent was greater than the energy released upon mixing, an endothermic reaction would occur, and the solutes might not dissolve.

Answer:

The answer to your question is  U-234

Explanation:

Data

Thorium-234

beta emission twice

Definition

Beta emission is when a beta particle (electron) is emitted from an atomic nucleus.

First beta emission

                                            ²³⁴₉₀Th   ⇒    ²³⁴₉₁Pa + e⁻

Second beta emission

                                            ²³⁴₉₁ Pa   ⇒  ²³⁴₉₂U  + e⁻

The atom will be Uranium-324

Answer: U-234

Explanation: no matter how much of beta decay, the mass number of the resulting element is unchanged

Answer: a. 1046.98g b. 123.64 L

Explanation:

.a. To determine the mass of TiCl4 needed to complete the reaction with 155 liters of H2 at 430 degree Celsius and 780 mmHg pressure.

First, use the ideal gas equation to determine the number of moles of H2.

PV = nRT

R= 0.082 Latm/molK

Convert Pressure to atmosphere and temperature to kelvin so the units of calculation can be uniform;

1 atm is equals to 760 mmHg so 780mmHg will be (780/760) atm = 1.0263 atm

430 degree Celsius = (430 +273.15) K

= 703.15 K

Therefore, n = PV/RT

= (1.0263*155)/ (0.082*703.15)

= 2.76 of H2 will be needed to complete the reaction

From the chemistry of the reaction, it can be seen that 2 moles of TiCl4 is needed to react with 1 mole of H2.

So for 2.76 moles of H2 , (2*2.76 moles) of TiCl4 will be needed which is equals to 5.52 moles of TiCl4.

The mass of TiCl4 can be calculated using the formular;

Mass = molar mass * number of moles

The molar mass of TiCl4 cab be calculated using the molar mass of each of its element (Ti =47.87 g/mol, Cl= 35.45 g/mol).

The molar mass of TiCl4 = 47.87 + (4*35.35) = 189.67 g/mol

Therefore,

The mass of TiCl4 = 189.67 g/mol * 5.52 mols

= 1046.98 g of TiCl4.

b. The amount of liters of HCl gas to be produced at STP. STP means standard temperature and pressure which is 273.15 K and 1 atm

From the chemistry of the reaction, it can be seen that with 1 mole of H2 is needed to produce 2 moles of HCl.

So for 2.76 moles of H2, (2*2.76 moles) of HCl will be produced which is equals to 5.52 moles of HCl. Therefore, the volume of HCl produced at 430 degree Celsius and 780 mmHg pressure will be;

V = nRT/P

= 5.52* 0.082 *703.15 / 1.0263

= 310.118 L

The combined gas law states that PV/T = constant. Therefore

P1V1/T1 = P2V2/T2

Now using the combined gas law;

P1 = 1.0263 atm, V1 = 310.118 L, T1 = 703.15 K

P2 = 1 atm, V2 =?, T2 = 273.15 k

So,

V2 = (1.0263*310.118*273.15)/ (1*703.15)

= 123.64 L

To find the grams of TiCl4 needed, use the ideal gas law equation and the balanced chemical equation. To find the liters of HCl gas at STP, use the ideal gas law equation and the balanced chemical equation.

In order to determine the grams of TiCl4 needed, we need to use the ideal gas law equation: PV = nRT. First, we need to convert the given volume of H2 to moles by using the ideal gas law. Then, we can use the balanced chemical equation to find the ratio of moles of H2 to moles of TiCl4. Finally, we can convert moles of TiCl4 to grams using the molar mass of TiCl4.

To determine the liters of HCl gas at STP, we can use the ideal gas law equation again. We can find the moles of HCl gas produced by using the balanced chemical equation, and then convert the moles to liters at STP using the molar volume of a gas at STP.

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When calculating the number of moles of CO₂ and Hg, we have:

a) There are 4.02 moles of CO₂ in 2.42x10²⁴ molecules.

b) There are 0.010 moles of Hg in 6.23x10²¹ atoms.

a) The number of moles of CO₂ that are in 2.42x10²⁴ molecules can be calculated with Avogadro's number (N = 6.022x10²³)

[tex] n = \frac{1 mol}{6.022 \cdot 10^{23} \:molecules}*2.42 \cdot 10^{24} \:molecules = 4.02 moles [/tex]    

Hence, the number of moles of CO₂ is 4.02.

b) To find the number of moles of Hg equivalent to 6.23x10²¹ atoms, we need to use Avogadro's number:

[tex] n = \frac{1 mol}{6.022 \cdot 10^{23} \: atoms}*6.23 \cdot 10^{21} \: atoms = 0.010 moles [/tex]

Therefore, the number of moles of Hg is 0.010.  

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Explanation:

It is known that formula for area of a sphere is as follows.

                     A = [tex]4 \pi r^{2}[/tex]

                        = [tex]4 \times 3.14 \times (0.50 m)^{2}[/tex]

                        = 3.14 [tex]m^{2}[/tex]

    [tex]T_{a}[/tex] = (27 + 273.15) K = 300.15 K

          T = (77 + 273.15) K = 350.15 K

Formula to calculate the net charge is as follows.

             Q = [tex]esA(T^{4} - T^{4}_{a})[/tex]

where,    e = emissivity = 0.85

               s = stefan-boltzmann constant = [tex]5.6703 \times 10^{-8} Wm^{-2} K^{-4}[/tex]

                A = surface area

Hence, putting the given values into the above formula as follows.

                 Q = [tex]esA(T^{4} - T^{4}_{a})[/tex]

                     = [tex]0.85 \times 5.6703 \times 10^{-8} Wm^{-2} K^{-4} \times 3.14 \times ((350.15)^{4} - (300.15)^{4})[/tex]

                     = 1046.63 W

Therefore, we can conclude that the net flow of energy transferred to the environment in 1 second is 1046.63 W.

The answers are as follows:

1) Evolution is still taking place in the Galapagos finches

Why?

Evolution basically consists on random mutations that affect the population of a species, that are conserved when those mutations help the affected individuals to better adapt to their environment, in a process known as natural selection.

Random mutations are still affecting the finch population in the Galapagos Islands, and when one of those mutations provides an advantage, the species will continue to evolve. However, these changes occur over long periods of time, and its unlikely that we will see the evolved species in our lifetime.

2)  Human activities can lead to speciation

Speciation is the process in which new species are created by natural or artificial selection.

Why?

Human activities can speed up this process by creating external pressure in the form of artificial selection. There are many examples of this in our history, but common cases are the separation of the Dog (Canis familiaris) from the Wolf (Canis lupus). Wolves with desirable traits (non-aggressive, cooperative, small size) were artificially selected by humans and in time, a new species was created. Other examples can be the different species of cattle and sheep.

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Answer: 6

Explanation:

Alcohol is a psychoactive drug with a high number of side effects that can seriously affect our body. The amount and circumstances of consumption play an important role in determining the duration of intoxication. For example, consuming alcohol after a large meal is less likely to produce visible signs of intoxication than on an empty stomach.

Alcohol has a two-phase effect on the body, meaning that its effects change over time.  Initially, it produces feelings of relaxation and joy, but later consumption can lead to blurred vision and coordination problems.  Cell membranes are highly permeable to alcohol, so once alcohol is in the bloodstream, it can spread to almost all body tissues.  

Unconsciousness can follow excessive consumption, and extreme levels of consumption can lead to alcohol poisoning and death. Death can also be caused by asphyxiation, if vomit - a frequent result of excessive drinking - blocks the windpipe and the individual is too drunk to respond.  An appropriate first-aid response to an unconscious, drunk person is to place him or her in the recovery position.  

When alcohol enters the bloodstream (30-90 minutes after ingestion), there is a decrease in the sugars present in the bloodstream, causing a feeling of weakness and physical exhaustion. This is because alcohol accelerates the transformation of glycogen (a substance that stores sugar in the liver) into glucose, which is then eliminated more quickly.  

After the ingestion of alcohol, a series of effects or symptoms occur in the short term, depending on the dose ingested (although other individual factors are affected).

Alcohol is broken down mainly in the liver, which can metabolize about 1 drink per hour for men. Factors such as age, weight, gender, and the amount of food eaten can affect how quickly the body can process alcohol. The amount of time alcohol can be detected in blood is up to 6 hours. Then it is not recommended to drink alcohol until after 6 hours if you have been involved in an accident, since alcohol can be detected in the blood in that time range. Because of the effects alcohol has on the body and how it can affect driving, if alcohol is detected you can be legally charged with driving under its influence.

Answer: Option B

Explanation:

Dead space is the volume of sir in the body which is inhaled but it does not takes part in the gaseous exchange this is because it does not contains alveoli.

Not all the air that is inhaled inside the body is used in the process of respiration.

The dead space in the lungs is the region which helps in conducting airways, the air is not perfused to the alveoli.

Dead space is the portion of the respiratory system that contains no alveoli and does not participate in gas exchange. Therefore, option B is correct.

The respiratory system is a complex network of organs and tissues involved in the process of respiration.

Dead space refers to the portion of the respiratory system where there is no gas exchange occurring. It includes areas such as the trachea, bronchi, and bronchioles, which do not have alveoli. In these regions, the primary function is to conduct air to and from the alveoli, but no actual gas exchange occurs.

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Answer:Ba^2+ is a solid because the concerntration ofSO4 ion for the separation is 3.0×10^4M

Explanation: The equation for the reaction are:

1. BaSO4 ---->Ba^2+ SO4^2-

Ksp=1.1×10^-10

2.CaSO4 ------> Ca^2+ + SO4^2-

Ksp=2.4×10^-5

/Ba^2+/=0.150M

/Ca^2+/=0.080M

Calcuim sulfate is more soluble than barium sulfate, therefore add SO4^2- ion to leaveCa^2+ in the solution and precipitate Ba^2+ ions.

SO4^2-= 2.4×10^-5/0.080

SO4^2-=3.0×10^-4 M

ForCa^2+ ion to be left in the solution,reaction quotient must be less than the Ksp

Q=[Ca^2+][SO4^2-] <ksp

SO4^2- =Ksp/[Ca^2+]

Answer:

[KOH] = 1.47 M

[KOH] = 1.22 m

KOH = 6.86 % m/m

Explanation:

Let's analyse the data

1.87 L is the volume of solution

Density is 1.29 g/mL → Solution density

155 g of KOH → Mass of solute

Moles of solute is (mass / molar mass) = 2.76 moles.

Molarity is mol/L → 2.76 mol / 1.87 L = 1.47 M

Let's determine, the mass of solvent.

Molality is mol of solute / 1kg of solvent

We can use density to find out the mass of solution

Mass of solution - Mass of solute = Mass of solvent

Density = Mass / volume

1.29 g/mL = Mass / 1870 mL

Notice, we had to convert L to mL, cause the units of density.

1.29 g/mL . 1870 mL = Mass → 2412.3 g

2412.3 g - 155 g = 2257.3 g of solvent

Let's convert the mass of solvent to kg

2257.3 g / 1000 = 2.25kg

2.76 mol / 2.25kg = 1.22 m (molality)

% percent by mass = mass of solute in 100g of solution.

(155 g / 2257.3 g) . 100g = 6.86 % m/m

The molarity, molality, and mass percent concentration of the KOH solution are approximately 1.476 M, 1.224 m, and 6.43%, respectively.

The first step in solving this problem is to determine the number of moles of KOH in the solution. The molar mass of KOH is approximately 56.11 g/mol, so you can calculate the number of moles by dividing the mass of the KOH by its molar mass: moles of KOH = 155 g / 56.11 g/mol = 2.762 mol.

Molarity (M) is defined as the number of moles of solute per liter of solution. To find the molarity, divide the number of moles by the volume of the solution in liters: M = 2.762 mol / 1.87 L = 1.476 M.

To calculate molality (m), you need the mass of the solvent in kilograms. First, find the total mass of the solution: mass = volume x density = 1.87 L x 1.29 g/mL = 2411.3 g. Then, subtract the mass of the KOH to find the mass of the solvent: mass of solvent = 2411.3 g - 155 g = 2256.3 g = 2.2563 kg. Now, you can find the molality: m = 2.762 mol / 2.2563 kg = 1.224 m.

Finally, the mass percent concentration of the solution is the mass of the solute divided by the mass of the solution, multiplied by 100: mass percent = (155 g / 2411.3 g) x 100 = 6.43%.

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Answer:Z1 and Z4 only

Explanation:

One general property of all metals is that they form positive ions (cations) by electron loss. Secondly, elements of group VIIA have high electron affinities hence they easily accept electrons to form negative ions. The bonding between metals and elements in this group is almost always ionic in nature.

Answer:

Answer:

Which of the following pairs of substances best illustrates the law of multiple proportions?

A. H2 and O2

B. NO and NO2

C. P2O5 and PH3

D. CaCl2 and CaBr2

B. NO and NO2

best shows the law of multiple proportions.

Explanation:

Which of the following pairs of substances best illustrates the law of multiple proportions?

A. H2 and O2

B. NO and NO2

C. P2O5 and PH3

D. CaCl2 and CaBr2

B. NO and NO2

best shows the law of multiple proportions.

law of simple multiple proportions. Law of multiple proportions, states that when two elements react with oneaother to form more than one compound, the weights of one element that combine with the fixed weight of the other element are in small whole number ratios.

Here Nitrogen, N which is fixed combines with Oxygen in two compounds in ratios 1 to 1 and 1 to 2

Answer:

The sodium chloride serves to pull out the water from the organic layer to the aqueous or water layer

Explanation:

Shaking it with sodium chloride also called brine pulls the water away from the organic composition to the water layer due to the affinity of the salt to absorb more water and become less concentrated and dense as the salt has more ability to absorb the water than to absorb organic compounds

Answer:

Your question is incomplete, but it could deal with organic structures just like the ones I attached in this answer. So I hope it helps you.

Q1. A) One hydogen atom

Q2. E) None

Q3. A) One Hydrogen atom

Explanation:

Each carbon can make 4 covalent bonds with Hydrogene because of its 4 valencies. If a carbon has only three covalent bonds, the C atom will be charged; in the 3 questions that I´m aswering here, the carbons are charged and they are carbocations (there is no lone pair of electrons and the charge is positive). We can also find carbanions (there is one lone pair of electrons and the charge is negative).

In the molecules on the attachement file, you can notice that the first one has already 2 bonds with adjacent carbons, the next one has 3 bonds and the last one has 2; in every structure, the indicated carbon is a carbocation (no lone pairs of electons).  A cabocation can make 3 covalent bonds, so, for the first and the last molecules, there is one hyrogen atom connected to it, for the second there is none.