Anyone, answer this Dalton's Law of Partial Pressure?

A mixture of gases contains 97% by volume CH4, 1.5% C2H6 by volume, 1% Co2 by volume and 0.5% N2 by volume. This was collected at a total pressure of 101KPa. What is the partial pressure(in atm) of each gas in the mixture?

Thank you so much.

joeyeehu...

Best Answer - Chosen by Voters

Since the volume of gas is proportional to the number of moles, we can directly use the percentage of volume of gas to calculate the partial pressure of each gas.

Using the Dalton's Law:

Partial pressure = mole fraction x total pressure
........................= % volume x total pressure

Hence, P(CH4) = 0.97 x 101 = 97.97 kPa
P(C2H6) = 0.015 x 101 = 1.515 kPa
P(CO2) = 0.01 x 101 = 1.01 kPa
P(N2) = 0.005 x 101 = 0.505 kPa

The unit of pressure can be converted by:

101325 Pa = 1 atm