Question

How much heat energy is necessary to raise the temperature of 10 kg of water from 50°C to 100°C?

Answer 1

Given: m = 10 kg, c = 1 kcal/kg °C

and change in temperature ΔT = 100 − 50 = 50°C

Energy to be supplied to water = Energy gained by the water

= mass of water × specific heat of water × change in temperature of water

= m × c × ΔT

= 10 × 50

= 500 kcal

Hence, the heat energy necessary to raise the temperature of the water is 500 kcal.