Question

Calculate the heat energy required to raise the temperature of 5 kg of water from 20℃ to

40℃. Specific heat capacity of water is 4200 J kg-1 k-1​

Answer 1

Given that,

Mass of water, m = 5 kg

The temperature increases from 20℃ to 40℃.

Specific heat capacity of water is 4200 J kg⁻¹ k⁻¹

To find,

Heat energy required to raise the temperature.

Solution,

The formula for the heat energy required to raise the temperature is given by :

`Q=mc\Delta T\\\\=5* 4200* (40-20)\\\\=420000\ J\\\\=420\ kJ`

So, the heat energy required is 420 kJ.