We are asked to find out how many kilocalories of heat does an expenditure of 576 kJ produce?
Recall that 1 kJ of energy produces 0.239 kcal of heat.
Then 576 kJ of energy can produce x kcal of heat.
Let us set up a simple proportion,
[tex]\frac{x\;kcal}{576\;kJ}=\frac{0.239\;kcal}{1\;kJ}[/tex]Let us solve for x.
[tex]\begin{gathered} \frac{x}{576}=\frac{0.239}{1} \\ x=0.239\times576 \\ x=137.67\;kcal \end{gathered}[/tex]Therefore, 137.67 kcal of heat will be produced for 576 kJ.
