A mixture of methane and ethane is contained in a glass bulb of 500cm^3 capacity at 25 degrees c. the pressure is 1.25 bar and the mass of the gas in the bulb is .530g.
a) what is the average molar maass of the gas? (21.0g/mol)
b) what is the mole fraction of methane?

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I need help with b

for a i used the following equation
\[M=\rho(\frac{RT}{p})\]

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