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## Homework Statement

A rigid cylinder of 1000cm cubed contains 4.168grams of an ideal gas mixture. The gas mixture consists of methane and ethane at a temperature of 100C and a pressure of 500kPa

a) Estimate the average molar mass of the mixure

b) Calculate the composition of the mixture on a mole fraction basis

c) Express the mixture composition on a mass fraction basis

## Homework Equations

PV=nRT

## The Attempt at a Solution

I calculated part a) already and found that to be 25.85kg/kmol. I am stuck on part b and c.

Thanks for any help.