Determine the mass of a CO2 gas that has a volume of 7.0 L at a pressure of 1.11atm and a temperature of 31.0?

Question

I know its The Ideal Gas Law im just not sure how to do this problem.

Answer 1

Use ideal gas law to calculate the number of moles of CO2, then convert from moles to grams by multiplying by 44 g (molar mass of CO2).

PV = nRT

(1.11 atm)(7.0 L) = (moles)(0.08206 L-atm/mol-K)(31 + 273 K)

7.77 atm-L = (moles)(24.95 L-atm/mol)

(7.77 atm-L) / (24.95 L-atm/mol) = moles = 0.3114 mol CO2

(0.3114 mol CO2)(44 g / mol CO2) = 13.7 g CO2