Problem: Palmitic acid (C16H32O2) is a dietary fat found in beef and butter. The caloric content of palmitic acid is typical of fats in general. Write balanced equations for the complete combustion of palmitic acid and table sugar (sucrose, C12H22O11). The standard enthalpy of formation of palmitic acid is –208 kJ/mol and that of sucrose is –2226.1 kJ/mol. [Use H2O(l) in the balanced chemical equations because the metabolism of these compounds produces liquid water.]Which dietary substance (sugar or fat) contains more Calories per gram?

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Part A

combustion reaction: sugar/fat + O2 (g) → CO2 (g) + H2O (l)


combustion of palmitic acid

reaction: C16H32O(s) + O2 (g) → CO2 (g) + H2O (l)


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Problem Details

Palmitic acid (C16H32O2) is a dietary fat found in beef and butter. The caloric content of palmitic acid is typical of fats in general. Write balanced equations for the complete combustion of palmitic acid and table sugar (sucrose, C12H22O11). The standard enthalpy of formation of palmitic acid is –208 kJ/mol and that of sucrose is –2226.1 kJ/mol. [Use H2O(l) in the balanced chemical equations because the metabolism of these compounds produces liquid water.]

Which dietary substance (sugar or fat) contains more Calories per gram?

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