How much heat is required to raise the temperature of 10kg of water from 25C to 45C? The specific heat capacity of water is 4200J\kg-C.

Solution:

Recall ΔH = m•Cp•ΔT where H is heat, m is mass, Cp is heat capacity and ΔT is temperature change.

The heat capacity of water is dependent on temperature but is commonly taken as 4200J/kg-C

In this case, we have 10 kg of water and a temperature change ΔT = 45 - 25 = 20C

So ΔH = 10(4200)(20) = 840000J= 840kJ

The heat required is 840kJ

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Updated on: 10-Oct-2022

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