Partial Pressure Calculation for Argon Gas Collected Over Water at 30.0oC

In summary, partial pressure is the pressure exerted by a single gas in a mixture of gases and is calculated by multiplying the total pressure by the mole fraction. It is important in various scientific applications and is affected by factors such as concentration, temperature, and volume. In biological systems, partial pressure is used to describe gas exchange, specifically the exchange of oxygen and carbon dioxide in the respiratory system through diffusion.
  • #1
chem31sa6
4
0
A sample of argon gas is collected over water at 30.0oC. The level of the
water is adjusted until the total pressure in the flask is 771 torr and the volume is 250.0
mL. The vapor pressure of water is 31.8 torr at 30.0oC.

A. How many moles of argon are in the flask?
B. What is the partial pressure of argon in the flask?
C. What is the total mass of gas in the flask?

I got:
a) 9.78e-3 mol
b) .973atm
c) 1.946 atm
 
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  • #2
And?

c is definitely wrong - mass is not measured in atm.
 

1. What is partial pressure?

Partial pressure is the pressure exerted by a single gas in a mixture of gases. It is equal to the total pressure of the gas mixture multiplied by the mole fraction of the single gas.

2. Why is partial pressure important?

Partial pressure is important in many scientific applications, including gas laws, chemical reactions, and gas exchange in biological systems. It helps to determine the behavior of individual gases in a mixture and their contribution to the total pressure.

3. How do you calculate partial pressure?

Partial pressure can be calculated using the ideal gas law, which states that the product of pressure and volume is equal to the product of the number of moles and the gas constant. In a mixture of gases, the partial pressure of a specific gas can be determined by multiplying the total pressure by its mole fraction.

4. What factors affect partial pressure?

The partial pressure of a gas is affected by its concentration, temperature, and volume. As the concentration or amount of a gas increases, its partial pressure also increases. Temperature and volume have an inverse relationship with partial pressure, where an increase in temperature or a decrease in volume will result in an increase in partial pressure.

5. How is partial pressure used in gas exchange?

In biological systems, partial pressure is used to describe the amount of oxygen and carbon dioxide in the blood. These gases have different partial pressures in the lungs and tissues, which allows for their exchange through diffusion in the respiratory system.

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