A sample of a gas has a mass of 1.73g and occupies 2.00L at 122C and 1.00atm.What is the molecular weight?

Question

A sample of a gas has a mass of 1.73 g and occupies 2.00 L at 122 Celsius and 1.00 atm. What is the molecular weight?

Answer 1

i am editing away my answer, chem man got there first with the same answer. here is my vote for him,

Answer 2

The molecular weight can be found by using the ideal gas law.

PV = n R T

n = m / M , where m = mass in g and M = molecular weight (or molar mass) in g/mol.

PV = m R T / M

M = m R T / P V =

1.73 g x 0.08206 L atm / K mol x 395 K / (1.00 atm x 2.00 L) = 28.0 g/mol.