QuestionMay 21, 2025

A chemical reaction releases 55.2 kcal. How many kilojoules does this correspond to? Multiple Choice 231 kJ 0.231 kJ 13.2 k J 1,320 kJ None of the choices are correct.

A chemical reaction releases 55.2 kcal. How many kilojoules does this correspond to? Multiple Choice 231 kJ 0.231 kJ 13.2 k J 1,320 kJ None of the choices are correct.
A chemical reaction releases 55.2 kcal. How many kilojoules does this correspond to? Multiple Choice 231 kJ 0.231 kJ 13.2 k J 1,320 kJ None of the choices are correct.

Solution
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Answer

231 kJ Explanation 1. Convert kcal to kJ Use the conversion factor **1 kcal = 4.184 kJ**. Multiply 55.2 kcal by 4.184 kJ/kcal. \[ 55.2 \, \text{kcal} \times 4.184 \, \frac{\text{kJ}}{\text{kcal}} = 230.9568 \, \text{kJ} \] 2. Round the result Round 230.9568 kJ to three significant figures, which is 231 kJ.

Explanation

1. Convert kcal to kJ<br /> Use the conversion factor **1 kcal = 4.184 kJ**. Multiply 55.2 kcal by 4.184 kJ/kcal.<br /><br />\[ 55.2 \, \text{kcal} \times 4.184 \, \frac{\text{kJ}}{\text{kcal}} = 230.9568 \, \text{kJ} \]<br /><br />2. Round the result<br /> Round 230.9568 kJ to three significant figures, which is 231 kJ.
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