posted by Anonymous .
In the following reaction, how many liters of oxygen will react with 124.5 liters of propane (C3H8), at STP?
C3H8 + 5O2 = 3CO2 + 4H2O
Since all are gases one may use a shortcut that tells us we can use liters directly as moles. All you need to do is to convert 124.5 L propane to oxygen using the coefficients in the balanced equation.
124.5L x (5 moles propane/1 mol oxygen) = ? L O2.
622.5 not 662.5