Question

$1calorie$ = ______ $joule$.

Answer 1

$$\begin{gathered} wehave \\ 1J=0.000239kcal \\ =0.000239\times {10}^{3}cal \\ =0.239cal \\ 1cal=\frac{1}{0.239}J \\ 1cal=4.184J \end{gathered}$$

Hence 1 calorie = 4.18 joule.