The amount of oxygen required for the complete combustion of 1 mole of Acetylene is?

2 C2H2+5 O2→ 4 CO2+2 H2OFor the combustion of 2 mole of Acetylene 5 mole of oxygen required. For the combustion of 1 mole of Acetylene 2.5 moles of oxygen required.  Molecular weight is 32.           2.5 moles of oxygen weight is 2.5*32=80g