Question

When a mole of decane undergoes complete combustion, how many moles of water are formed?

Answer 1

Lets write combustion reaction of decane

C10H22 + O2 --- > CO2 + H2O

Lets balance this reaction.

2C10H22 +31 O2 --- > 20CO2 + 22 H2O

From this balanced reaction we get mole ratio of Decane to H2O and that is 2 : 22

Lets find moles of H2O formed per mol of decane .

Number of moles of water are formed from 1 mol of decane

= 1 mol decane x 22 mol H2O / 2 mol decane

= 11 mol H2O

So 11 mol of H2O are formed.