1. A mixture of ethane and methane is contained a glass bulb of 500 cm^3 capacity at 25 degree celsius. the pressure is 1.25 bar and the mass of the gas in the bulb is 0.53 grams. what is the average molar mass and what is the mole fraction of methane
2. Experiment by sir williams ramsey and by lord rayleigh around 1894 led to a gas residue remaining when all of the then known components of air had been removed. the density of the residue was 1.61 gm/liter at 25 degree celscius. what element had they obtained?
3. What is the volume of one mole of ethane at 350k and 70 bar according to (a) the ideal gas law (b) the van der waals equation