Problem: One of the best-selling light, or low-calorie, beers is 4.4 % alcohol by volume and a 12-oz serving contains 110 Calories; remember: 1 Calorie = 1000 cal = 1 kcal. Write a balanced chemical equation for the reaction of ethanol, C2H5OH, with oxygen to make carbon dioxide and water and use enthalpies of formation in Appendix C to determine ΔH for this reaction.

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Unbalanced Reaction: C2H5OH(l) + O2(g) → CO2(g) + H2O(g)

Balance C: Add a coefficient of 2 to CO2:

C2H5OH(l) + O2(g) → 2CO2(g) + H2O(g)

Balance H: Add a coefficient of 3 to H2O:

C2H5OH(l) + O2(g) → 2 CO2(g) + 3 H2O(g)

Balance O: Add a coefficient of 3 to O2:

C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(g)

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Problem Details

One of the best-selling light, or low-calorie, beers is 4.4 % alcohol by volume and a 12-oz serving contains 110 Calories; remember: 1 Calorie = 1000 cal = 1 kcal. Write a balanced chemical equation for the reaction of ethanol, C2H5OH, with oxygen to make carbon dioxide and water and use enthalpies of formation in Appendix C to determine ΔH for this reaction.

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