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Density of an Ideal Gas

A gas mixture was found to have a density of 0.26 g/L at 20 C and 0.245 atm. What was the average molar mass of the molecules?

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For these questions, it is best to combine three well known equations...

Ideal gas Law (PV = nRT)

P = pressure
V = volume
n = number of moles
R = Ideal gas constant
T = temperature in ...