posted by Abi .
Determine the mass of CO2 gas that has a volume of 7.10 L at a pressure of 1.11 atm and a temperature of 31.0°C.
Solve for the number of moles (n) using PV=nRT. R = 0.0821 liter·atm/mol·K, T= 31.0 +273K, P=1.11, V=7.10L. Rearrange the equation to give you n=PV/RT and plug in your values (n=[(1.11 atm)(7.10L)]/[(0.0821 liter·atm/mol·K)(31.0 +273.15K)]. Once you solve for the number of moles, divide n, by the molecular weight of CO2 (n/44.01 g/mol) which will give you the mass.