Question

How many moles of oxygen are needed for the complete combustion of 12.6 moles of acetylene?

2C2H2 + 5O2 → 4CO2 + 2H2O

Answer 1

The moles of oxygen required to completely react with 1-mole acetylene is 2.5 mol.

The moles of reactant and product in a chemical reaction to the whole number ratio is given by the stoichiometric coefficient of the balanced chemical equation.