IMAT 2015 Q49 [Ratio Of Molecules]

When propan­-1­-ol is burnt in excess oxygen the only products formed are carbon dioxide and water.

In the balanced equation for this reaction what is the ratio of CO_2 : H_2O molecules formed?

A. 4 : 7
B. 3 : 8
C. 2 : 7
D. 3 : 4
E. 5 : 12