Question

How much thermal energy is needed to change the temperature of kg of water from 25 degrees Celsius to boiling (Hint : boiling in Celsius = ??

Answer 1

∆H = mc∆T

c = specific heat capacity

c of water = 4200 J/kg °C

∆H = 1 * 4200 * (100°C - 25°C)

∆H = 315000J

∆H = 315 KJ