What volume of O2 (m3) is needed for the complete combustion of 175 g of C3H8 at 10.0oC and 100.0 kPa?

Answer 1

Just like the ethane problem earlier, write a balanced reaction:
C3H8 + 5O2 -> 3CO2 + 4H2O.
Find number of moles in 175 g of propane. (about 4)
Find number of moles of O2 to combust 4 moles of propane (from rxn, about 20)
From ideal gas law, find volume for 20 moles at the T and P conditions (about 0.46 m^3)