Chemistry, 24.03.2020 21:42 orozcoalbeert

Solve for partial pressure.

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Answers

Answer from: Redhead667

0.25 atm

Explanation:

Follow the steps suggested:

1. What is given:

i) Initial conditions, volume, pressure and temperature of three gases in connected, but separate containers.

a) He:

Volume: 1.5 liter

Pressure: 0.5 atm

Temperature: 298K

b) Ar:

Volume: 0.5 liter

Pressue: 2.0 atm

Temperature: 298 K

c) N₂: 1.0 liter

Pressure: 1.0 atm

Temperature: 298 K

ii) The final volume of the mixture of gases, at the same temperature of the intial gases.

a) V = 3.0liter

b) T = 298K

2. What do you want to know?

a) The partial pressure of the He gas in the mixture.

3. What else do you need to know.

a) You should calculate the number of moles of He gas.

b) You will need the ideal gas equation

c) You will need the universal constant of gases:

R = 0.08206atm×liter / (k×mol)

d) You must know that in a mixture, the partial pressure of every gas is calculated as if each gas occupied the complete volume of the container.

You do not need to find the number of moles of the other gases.

Solution

1. Use the ideal gas equation to find the number of moles of He from the initial conditions:

pV=nRT

$n=\dfrac{pV}{RT}$

Substitute:

$n=\dfrac{0.5atm\times 1.5liter}{0.08206atm\cdot liter/(K\cdot mol)298K}=0.03067mol$

2. Calculate the pressure of that amount of He gas at the final conditions

$P=\dfrac{nRT}{V}\\\\\\P=\dfrac{0.03067mol\times 0.08206atm\cdot liter/(k\cdot mol)\times 298K}{3.0liter}$

P=0.25atm

Answer from: Quest

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

Answer from: Quest

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.

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Solve for partial pressure.
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