A sample of a gas weighs 4.526g and has a volume of 890.0 mL at 645.0 torr and 29(degrees C). What is its molar mass?

4 answers

Someone worked this for you about three pages ago. I'll try to find it and give you a link here.
http://www.jiskha.com/display.cgi?id=1301522559
how do you get the molar mass from the moles?
moles = grams/molar mass
You know moles and you know grams, solve for molar mass.