The vapor pressure of liquid hexane, C_6 H_14, is 40.0 mm Hg at 271 K. A sample of C_6 H_14 is placed in a closed, evacuated container of constant volume at a temperature of 400 K. It is found that all of the C_6 H_14 is in the vapor phase and that the pressure is 74.0 mm Hg. If the temperature in the container is reduced to 271 K, which of the following statements are correct? Choose all that apply. a) Liquid hexane will be present. b) Some of the vapor initially present will condense. c) Only hexane vapor will be present. d) No condensation will occur. e) The pressure in the container will be 50.1 mm Hg.

The mass percent of 3.87 g KCl dissolved in 55.6 g \(H_2O\) is 6.49%.

For the first question:

Mass of solute (KCl) = 3.87 g

Mass of solvent (H2O) = 55.6 g

Mass percent of solute = (mass of solute / mass of solution) x 100%

Mass percent of KCl = (3.87 g / (3.87 g + 55.6 g)) x 100%

Mass percent of KCl = 6.49%

Therefore, the mass percent of 3.87 g KCl dissolved in 55.6 g H2O is 6.49%.

For the second question:

Mass of solute (\(KNO_3\)) = 16.5 g

Mass of solvent (\(H_2O\)) = 848 g

Mass percent of solute = (mass of solute / mass of solution) x 100%

Mass percent of \(KNO_3\) = (16.5 g / (16.5 g + 848 g)) x 100%

Mass percent of \(KNO_3\) = 1.91%

Therefore, the mass percent of 16.5 g \(KNO_3\) dissolved in 848 g \(H_2O\) is 1.91%.

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Answer:D

Explanation:

A P E X

The following will be true regarding the relative partial pressures of the gases remaining in the vessel after some of the gas mixtures have effused. Pressure H₂ < Pressure  N₂ < Pressure Ar

Let us first write the formula for Graham's law of diffusion/effusion to answer this question.

r ∝ 1/√M

Where;

r denotes the diffusion/effusion rate.

M denotes molar mass.

In effusion, a barrier with very small holes usually prevents the gas from rapidly expanding into a new volume. As a result, the heavier the gas, the slower the effusion rate; the lighter the gas, the faster the effusion rate.

Now, the heavier gas has a higher pressure than the lighter ones.

The molar masses of the following gases are as follows:

Molar mass of H₂ = 2.016 g/mol

Molar mass of Ar = 39.95 g/mol

Molar mass of N₂ = 28.0134 g/mol

The rate of effusion is inversely proportional to the molar mass, according to the effusion equation.

As a result, the higher the molar mass, the lower the effusion rate and, as a result, the higher the pressure because it is a heavy gas.

As a result, Ar has the greatest molar mass and will experience the greatest pressure.N₂  comes next, followed by H₂.

If a container is filled with more than one gas, each gas exerts pressure on the container. The partial pressures of any gas within the container are referred to. Partial pressure is the pressure exerted by one of the gases in the mixture if it occupies the same volume on its own.

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The complete question is:

equal numbers of moles of h2(g), ar(g), and n2(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixtures have effused?

a) Pressure  H₂< Pressure N₂ < Pressure Ar

b) Pressure  H₂ < Pressure Ar < Pressure N₂

c) Pressure Ar < Pressure  N₂< Pressure  H₂

d) Pressure  H₂ = Pressure Ar = Pressure N₂

Answer:

Neutrons and protons

Explanation:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

The molality of the magnesium chloride solution dissolved in 500g of water is 1m.

Molality is the concentration of a substance in solution, expressed as the number of moles of solute per kilogram of solvent.

The molality of a solution can be calculated by dividing the number of moles of solute by the mass (in kilograms) of solvent as follows:

molality = no. of moles/mass

According to this question, 48 grams of MgCl2 dissolved in 500g of water. 48 grams of magnesium chloride is equivalent to 0.5041 moles. 500 g of water is equal to 0.5kg.

molality = 0.5041 mol / 0.5kg

molality = 1m

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Answer: Balance, multiply, find ratio

Explanation:

Balance the equation to be able to multiply correctly and accurately, multiply, and this will give you the molar ratio

Answer:

\(189kJ\)

Explanation:

Hello!

In this case, since one mole of ethanol release 8,842 J per 1 mole of ethanol, we can write:

\(\frac{8,842J}{1molC_2H_6H}\)

Thus, since we need the energy released by 982.6 g of ethanol, we compute the moles in such mass of fuel:

\(n=982.6g\frac{1mol}{46.08g} =21.3mol\)

Therefore, the result is:

\(\frac{8,842J}{1mol}*21.3mol=188,545J\)

Which in kJ is:

\(189kJ\)

Best regards!

Answer:

The number of moles of strontium sulfide produced is:

= 1.663.

Explanation:

Chemical formula for strontium sulfide = SrS

Production of strontium sulfide = 199g

1 mole = 1 moles Strontium Sulfide, which is equal to 119.685 grams

The number of moles of strontium sulfide produced = 1.663 (199/119.685)

The number of moles of strontium sulfide produced is the dividend of the amount of strontium sulfide produced during the experiment divided by the mass of 1 mole.

Answer:

234567890

Explanation:

The electron configurations that are not valid among the options are 1s²2s²2p 3s 3p 4s²4d¹04p5 and 1s²2s²2p 3s³3d5. Options 1 and 2.

The electron configuration of atoms using the various orbital levels follows the order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

Also, according to Afbau principle, orbitals with low energy levels are filled with electrons before orbitals with higher energy levels.

Using the above,  1s²2s²2p 3s 3p 4s²4d¹04p5 is incorrect for some reasons:

1s²2s²2p 3s³3d5 is incorrect because:

The remaining electron configurations are correct with correctly placed electrons in the various orbitals.

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The statement that is not part of Dalton's atomic theory is that atoms are composed of protons, neutrons, and electrons. Option C.

The statement that is not part of Dalton's atomic theory is that atoms are composed of protons, neutrons, and electrons.

This statement is not part of Dalton's atomic theory because the existence of subatomic particles such as protons, neutrons, and electrons was not discovered until much later, after Dalton's time.

Dalton believed that atoms were indivisible and indestructible particles, and did not have knowledge of the internal structure of atoms. The discovery of subatomic particles and the development of atomic models to explain their behavior came after Dalton's atomic theory was formulated.

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The ion concentration of 0.05 M \(CaCl_2\) would be 0.05 mol Ca ions and 0.1 mol Cl ions respectively.

\(CaCl_2\) contains two ions according to the following equations:

\(CaCl_2 -- > Ca^{2+} + 2Cl^-\)

1 mole           1 mole   2 moles

0.05 M CaCl2 contains 0.05 moles of the solute in 1 liter of the solution. Thus, the equivalent mole of Ca ion would be 0.05 moles while that of Cl ion would be 0.10 mole (0.05x2).

Concentration of Ca ions = 0.05 moles

Concentration of Cl ions = 0.05 x 2 = 0.010 moles

In other words, the ion concentrations of 0.05 M CaCl2 would be 0.05 moles of Ca ions and 0.10 moles of Cl ions.

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The term that the scientist would use in this case is partial pressure. Option D

The pressure that one particular gas component within a mixture of gases exerts is referred to as partial pressure. It is the pressure that the gas would experience at the same temperature if it were the only thing in the entire volume.

When researching gas mixtures, such as in gas laws, gas phase equilibria, and gas collecting methods, partial pressures are extremely crucial for the gas.

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At 25°C, water vapour typically forms at a heat of -57.8 Kcal/mole. suppose H were to fill The Diffusible Hindenberg, which has a capacity of 1.4 * 10 8 litres.

The relative humidity that a person encounters in a given region is one of the best instances of vapour pressure in real life. The difference between the saturated vapour pressure of water in the air and the actual vapour pressure of water in the air is known as relative humidity.

Certainly a pure substance, water vapour. Yet, as moisture can condense or evaporate, changing the mixture's composition, wet air is not a pure substance.

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Answer:

For every pound lost, replace it with 16 to 20 ounces of fluid

Answer:

2H₂ + O₂  ===>  2H₂O

Explanation:

Answer:

The pH of seawater is about 8.1, making it alkaline.

Explanation:

Water has three states of matter namely gas, solid or ice form and liquid. Molecules in solid state are not able to move since they are tightly packed.

Molecules can move in liquid state and they moves easily in gaseous state.

Every substance have three states, that are gas, liquid and solid. In solid state, molecules are tightly packed and are unable to move apart. In liquid state, molecules have some space to move and motion of liquid is easy.

The movement of molecules in a substance depends on the space allotted for them or called the volume. More volume between molecules, easy to move apart.

Gaseous state is composed of molecules located far apart from each other and they diffuse easily. Therefore, motion in three states of water is different and moves faster in gaseous state.

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false

cells are made up of nucleus and cytoplasm and it's contained within the cell membrane

They mainly store materials for other cells to use.

Answer:

true

Explanation:

It is because it appears uniformly in the eye

Given the data from the question,

A. The number of mole of water needed for the reaction is 1 mole

Bi. The number of mole of C₂H₂ formed is 0.5 mole

Bii. The number of mole of Ca(OH)₂ formed is 0.5 mole

Mole = mass / molar mass

Mole of CaC₂ = 32 / 64

Mole of CaC₂ = 0.5 mole

Balanced equation

CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂

From the balanced equation above,

1 mole of CaC₂ required 2 moles of H₂O

Therefore,

0.5 mole of CaC₂ will require = 0.5 × 2 = 1 mole of H₂O

Thus, 1 mole of H₂O is needed for the reaction.

Balanced equation

CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂

From the balanced equation above,

1 mole of CaC₂ reacted to produce 1 mole of C₂H₂

Therefore,

0.5 mole of CaC₂ will also react to produce 0.5 mole of C₂H₂

Thus, 0.5 mole of C₂H₂ was obtained from the reaction

Balanced equation

CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂

From the balanced equation above,

1 mole of CaC₂ reacted to produce 1 mole of Ca(OH)₂

Therefore,

0.5 mole of CaC₂ will also react to produce 0.5 mole of Ca(OH)₂

Thus, 0.5 mole of Ca(OH)₂ was obtained from the reaction

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Answer:

20000

Explanation:

Answer:

Now that you have the knowledge of the highest specific heat capacity and lowest porosity, which material would you choose to build Rover's new doghouse roof?

Oak has the highest heat capacity; therefore, oak can absorb a lot of heat without raising its temperature. This is good for very hot areas. Concrete has the lowest porosity so water will not leak through its pores and drip into the doghouse. This is good for rainy areas. However, clay is second on both lists and might be a good choice overall for hot and rainy weather conditions. Rover should be happy with this.

xXxAnimexXx

Have a great day!

Answer:

Oak has the highest heat capacity; therefore, oak can absorb a lot of heat without raising its temperature. This is good for very hot areas. Concrete has the lowest porosity so water will not leak through its pores and drip into the doghouse. This is good for rainy areas. However, clay is second on both lists and might be a good choice overall for hot and rainy weather conditions. Rover should be happy with this.

Hope this  helps!

The equation  in the question is: H+H → H + H Complete the equation by filling in the missing parts. missing part is  1 → H+H-2 → →3 → He.

The atomic number of hydrogen is 1, which means it has only one proton in the nucleus and one electron in its shell. Two hydrogen atoms react with each other to form helium. Helium has 2 protons and 2 neutrons in its nucleus and two electrons in its shell. Therefore, the equation is:

H + H → HeIt can be seen that:1. H + H (Reactants)

2. → (Yields or Reacts to form)

3. He (Product)Therefore, the tiles will be arranged as shown below: 1 → H+H-2 → →3 → He

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Answer:

  -172.6 °C

Explanation:

You want to know the Celsius equivalent of the temperature 100.6 K.

The relation is ...

  C = K - 273.15

  C = 100.6 -273.15 = -172.55

The temperature is -172.55 °C, about -172.6 °C.

__

Additional comment

We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.

Answer:

Explanation:

pOH = -log1.36 X 10^-10 = 9.87

pH = 14-pOH = 14-8.97 = 5.03

Answer:

6.5

Explanation:

half of 5 is 2.5, half of 8 is 4. 2.5+4=6.5

:)

Answer:

Explanation:

The relative speed and distance of atoms in a substance depend on the state of matter.

In a solid, atoms are closely packed together and have minimal movement or vibration. Their relative speed is low and their distance from one another is short.

In a liquid, atoms are still close together but have more movement and freedom of movement than in a solid. Their relative speed is slightly higher than in a solid, and their distance from one another is slightly longer.

In a gas, atoms are widely spaced and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid or liquid, and their distance from one another is much greater.

In a plasma, atoms are ionized and have a high degree of movement and freedom of movement. Their relative speed is much higher than in a solid, liquid or gas, and their distance from one another is much greater.