Calculate the molar mass of a gas if 0.805g of this gas has a pressure of 4.00 bars at 305K in a 1 L. What is the gas density at this T and P, and what is the density at STP

Answer 1

gas density= mass/volume for the first case, both are given.

PV=nRT= mass/molmass*RT
solve for molmass, you are give all else

AT stp, you know T, P, n solve for new V
then gas density = mass/newvolume

Answer 2

Umm not clear... I don't understand at all.