Question

how many kilocalories are in an orange containing 63 kj of energy?
? kcal

Explanation:

Step1: Recall the conversion factor

The conversion factor between kilojoules (kJ) and kilocalories (kcal) is \( 1\ \text{kcal} = 4.184\ \text{kJ} \) (or approximately \( 4.2\ \text{kJ} \) for simpler calculations). We need to convert 63 kJ to kcal.

Step2: Set up the conversion

To convert from kJ to kcal, we use the formula: \( \text{Energy in kcal} = \frac{\text{Energy in kJ}}{4.184\ \text{kJ/kcal}} \)

Substitute the given energy value (63 kJ) into the formula:
\( \text{Energy in kcal} = \frac{63}{4.184} \approx 15.06 \) (using the more precise conversion factor) or if we use \( 4.2\ \text{kJ/kcal} \) for approximation: \( \frac{63}{4.2} = 15 \)

Answer:

\( \approx 15 \) (or more precisely approximately 15.06) kcal