chemistry
posted by sherly .
if 48.3 g of an unknown gas occupies 10.0 L at 40 degrees celsius and 3.10 atm, what is the molar mass of the gas?

PV = nRT and solve for n = number of moles. Then n = grams/molar mass. You know n and grams, solve for molar mass. Remember T must be in kelvin.