A sample of a gas weighs 4.526g and has a volume of 890.9 mL at 645.0 torr and 29(degrees C). What is its molar mass?

Question

I just need help setting this up!

Answer 1

First You convert 645.0 torr to atm, and also mL to L. You use PV=nRT, to find the number of moles.
Then you use the number of moles to get the molar mass. mol= mass/molar mass