Homework Help: Chem

Posted by B on Friday, March 28, 2008 at 10:06pm.

A chemist was asked to find the molecular mass of a gas. She massed the gas and found that 3.73 g of the gas occupied 300 cm3 at 25°C and 92.4 kPa. What is the molecular weight of the gas?

Chem - bobpursley, Friday, March 28, 2008 at 10:16pm
PV=nRT

solve for n. Now knowing the number of moles, you know the mass of n moles, so you can get the mol mass.
Chem - DrBob222, Friday, March 28, 2008 at 10:17pm
Use PV = nRT to calculate n = number of mols.
Then use mols = g/molar mass to calculate molar mass. Post your work if you get stuck.

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