Chem
posted by Peter .
A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas?
Thanks!

Use PV = nRT
Calcualte n
n= #moles = grams/molar mass
You know n and g, calculate molar mass 
How do I know what N is??

n comes from the equation PV = nRT.
You have V, P, T, and you know R (0.08206) . n is the only unknown in that equation.
Don't forget to change T to Kelvin.
K = 273 + Celsius. 
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