When using a limited quantity of oxygen to react with propane (C3H8), this will result in producing carbon monoxide (CO) and carbon dioxide (CO2) gases. If 25% of 128 g of propane used in such process is converted into CO and the rest into CO2, calculate:

Question

1- the volume of oxygen used at STP.
2- the mass of water vapor produced in such process.
Given that:
Atomic mass C=12, O=16, H=1

C3H8 + O2 = CO + H2O (Unbalanced)

Thank you!