Massapercentage van waterstofatomen in product
Massa producten: 284,13 g
2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O
In het product: 6 x 2 = 12 mol H-atomen
massa van 1 mol H-atomen: 1,008 g/mol
12 x 1,008 = 12,096 g waterstofatomen
Massapercentage: 12,096/284,13 x 100% = 4,257%