Question

1. How many kilocalories of heat does an expenditure of 703 kJ produce?

_____ kcal

2. A pound of body fat stores an amount of chemical energy equivalent to 3500 Cal. When sleeping, the average adult burns or expends about 0.45 Cal/h for every pound of body weight. How many Calories would a 151 lb person burn during 7 hours of sleep? (Note that 1 Cal = 1 kcal.)______Cal
3. How much heat in kcal must be added to 0.41 kg of water at room temperature (20°C) to raise its temperature to 47°C?

______ kcal

Answer 1

1.

Heat = 703 KJ

1 Kcal = 4.2 KJ

Heat in KCal = 703/4.2 = 168 Kcal . Answer