1. The problem statement, all variables and given/known data 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 2. Relevant equations PV=nRT 3. 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.