Question

A 1.0 g sample of food reacts with oxygen in a calorimeter containing containing 500 g of water. The temperature rises 10c what is the energy content of the food?

A. 20.92 Calories/g
B. 18.25 calories/g
C. 5 calories/g
D. 50 calories/g

Answer 1

we can determine the energy (heat) using the following formula

heat= specific heat x mass x ΔT

specific heat (water)= 1.0 cal/ g C
mass= 500 g
ΔT= 10 C

heat= 1.0 x 500 x 10= 5000 calories

energy of content of the food= 5000 cal/ 1.0 g= 5000 cal/ g or 5 Cal/ g