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

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