Question

How many kilocalories of heat does an expenditure of 597 kJ produce? Answer must be in kcal

Answer 1

Recall,

1.0 cal = 4.184 J

1.0J = 1.0 cal/4.184 J = 1 x 10^-3 kcal/4.184 J

597 kJ = 597 x 10^3 J

Thus,

597 x 10^3 J = 597 x 10^3 J x 1 x 10^-3 kcal/4.184 J

= 597/4.18 kcal

= 142.8 kcal

The answer is 142.8 kcal