Question

7. A) A mixture of He, Ar, and Xe has a total pressure of 2.70 atm . The partial pressure of He is 0.200 atm , and the partial pressure of Ar is 0.250 atm . What is the partial pressure of Xe?

B) A volume of 18.0 L contains a mixture of 0.250 mole N2 , 0.250 mole O2 , and an unknown quantity of He. The temperature of the mixture is 0 ∘C , and the total pressure is 1.00 atm . How many grams of helium are present in the gas mixture?

Express your answer numerically in grams.

Answer #1

A)

PTotal = p(He) + p(Ar) + p(Xe)

2.70 atm = 0.200 atm + 0.250 atm + p(Xe)

p(Xe) = 2.25 atm

Answer: 2.25 atm

B)

Given:

P = 1.0 atm

V = 18.0 L

T = 0.0 oC

= (0.0+273) K

= 273 K

find number of moles using:

P * V = n*R*T

1 atm * 18 L = n * 0.08206 atm.L/mol.K * 273 K

n = 0.8035 mol

Now use:

total mol = n(N2) + n(O2) + n(He)

0.8035 = 0.250 + 0.250 + n(He)

n(He) = 0.3035 mol

Molar mass of He = 4.003 g/mol

use:

mass of He,

m = number of mol * molar mass

= 0.3035 mol * 4.003 g/mol

= 1.215 g

Answer: 1.22 g

Part A
A mixture of He, Ar, and Xe has a total pressure of 2.90 atm .
The partial pressure of He is 0.450 atm , and the partial pressure
of Ar is 0.250 atm . What is the partial pressure of Xe? Express
your answer to three significant figures and include the
appropriate units.
Part B
A volume of 18.0 L contains a mixture of 0.250 mole N2 , 0.250
mole O2 , and an unknown quantity of He....

Part A
A mixture of He, Ar, and Xe has a total pressure of 2.20 atm .
The partial pressure of He is 0.450 atm , and the partial pressure
of Ar is 0.400 atm . What is the partial pressure of Xe? Express
your answer to three significant figures and include the
appropriate units.
Part B
A volume of 18.0 L contains a mixture of 0.250 mole N2 , 0.250
mole O2 , and an unknown quantity of He....

A) A mixture of He, Ar, and Xe has a total pressure of 2.80 atm
. The partial pressure of He is 0.400 atm , and the partial
pressure of Ar is 0.300 atm . What is the partial pressure of
Xe?
B) A volume of 18.0 L contains a mixture of 0.250 mole N2 ,
0.250 mole O2 , and an unknown quantity of He. The temperature of
the mixture is 0 ∘C , and the total pressure is...

A volume of 18.0 L contains a mixture of 0.250 mole N2 , 0.250
mole O2 , and an unknown quantity of He. The temperature of the
mixture is 0 ∘C , and the total pressure is 1.00 atm . How many
grams of helium are present in the gas mixture?

A volume of 18.0 L contains a mixture of 0.250 mole N2 , 0.250
mole O2 , and an unknown quantity of He. The temperature of the
mixture is 0 ∘C , and the total pressure is 1.00 atm . How many
grams of helium are present in the gas mixture?

In a mixture of He, Ne, and Xe gases with a total pressure of
925 atm, if there is 10.5 g of each gas in the mixture, what is the
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gas mixture? Round your answer to the hundredths of a gram without
units.

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gas?

A mixture of He, N2, and Ar has a pressure of 24.5 atm at 28.0
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A)
A gas mixture with a total pressure of 760 mmHgcontains each of
the following gases at the indicated partial pressures: 124 mmHg
CO2, 216 mmHg Ar, and 177 mmHg O2. The mixture also contains helium
gas.
What is the partial pressure of the helium
gas?
Express your answer in millimeters of
mercury.
B) A sample of gas has a mass of 0.560 g . Its
volume is 116 mL at a temperature of 87 ∘C and a pressure of...

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