Question

A piece of iron of mass 2.0 kg has a thermal capacity of 966 J K^-1. Find : (i) heat energy needed to warm it by 15°C and (ii) its specific heat capacity in S.I. unit.

Answer 1

(i)We know that heat energy needed to raise the temperature by 15^o is = heat capacity × change in temperature.

Heat energy required = 966 J K^-1 × 15 K = 14490 J.

(ii)We know that specific heat capacity is = heat capacity/ mass of substance

So specific heat capacity is = 966 / 2 = 483 J kg^-1K^-1.