Chapter 15.1, Problem 2PP

Interpretation Introduction

Interpretation:

The energy in kilocalories is to be calculated which is equivalent to $86.5kJ$.

Concept introduction:

The given amount of energy is to be converted into kilocalories.

The conversion factor is:

$\begin{array}{l}1kJ=1000J\\ and1cal=4.184J\\ 1kcal=1000cal\end{array}$

Answer to Problem 2PP

$86.5kJ=20.67kcal$

Explanation of Solution

As, $\begin{array}{l}1kJ=1000J\\ and1cal=4.184J\\ 1kcal=1000cal\end{array}$

Therefore,

$\begin{array}{l}86.5kJ=86.5kJ\times \frac{1000J}{1kJ}\times \frac{1cal}{4.184J}\times \frac{1kcal}{1000cal}\\ =20.67kcal\end{array}$

Conclusion

$86.5kJ=20.67kcal$