Question

A piece of iron of mass 2.0 kg has a thermal capacity of 966 J/⁰C. Find: (i) Heat energy needed to warm it by 15⁰C, and (ii) Its specific heat capacity in SI unit.

Answer 1

(i) Given: Heat Capacity, me = 966 J/°C

Heat energy required, Q = m x C x change in temperature

= 966 x 15 = 14490 J

(ii) Q = m x C x T

Specific heat capacity, C = `"Q"/("m"Δ "T")`

                                       = `14490/(2 xx 15)`

                                       = 483 Jkg^-1 °C^-1