Find the volume of oxygen consumed for combustion of 100m3 C2H6.

1. Let’s write down the reaction equation:

2C2H6 + 7O2 = 4CO2 + 6H2O.

2. Find the amount of ethane that has reacted (Vm is the molar volume, constant equal to 22.4 l / mol):

100 m3 = 100,000 l.

n (C2H6) = V (C2H6) / Vm = 100000 L / 22.4 L / mol = 4464.3 mol.

3. According to the reaction equation, we find the amount and then the volume of the reacted oxygen:

n (O2) = n (C2H6) / 2 * 7 = 4464.3 mol / 2 * 7 = 15625 mol.

V (O2) = n (O2) * Vm = 15,625 mol * 22.4 l / mol = 350,000 l = 350 m3.

Answer: V (O2) = 350 m3.