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For the combustion reaction of ethane, C2H6(g) + nO2(g) → CO2(g) + H2O(l), what is the ratio of the stoichiometric coefficients of carbon dioxide to water in the balanced equation?

1. 1: 1
2. 2: 3
3. 3: 2
4. 1: 3

Correct answer: 2: 3

Solution

Balanced ethane combustion gives 2 CO2 and 3 H2O, so the CO2:H2O ratio is 2:3, not 1:1.

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