Question

A cup of coffee (97 grams) cools from 75° down to comfortable room temperature 20°C. How much energy does it release to the surroundings?

Answer 1

The specific heat capacity of coffee and milk is close to that of water. Since we have no information on its specific heat capacity. We assume it to take that of water = 4.18J/g.k

H= mcΔt

H = 97 × 4.18 × (75-20)

H = 97 ×4.18 ×55

H = 22300J