At STP, in the equation C(g) + O2(g) --> CO2(g), one liter of O2 yields how many liters of CO2?

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol