A piece of iron of mass 2.0 kghas a heat capacity of $966 J K^{- 1}$ . Find : (i) heat energy needed to warm it by $15^{0} C$ , and (ii) its specific heat capacity in S.I unit.

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Solution

(i)We know that heat energy needed to raise the temperature by $15^{o}$ is = heat capacity $\times$ change
in temperature.
Heat energy required = $966 J K^{- 1} \times 15 K = 14490 J$ .
(ii)We know that specific heat capacity is = heat capacity/ mass of substance
So specific heat capacity is = 966 / 2 = $483 J k g^{- 1} K^{- 1}$ .

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A piece of iron of mass 2.0 kghas a heat capacity of 966JK−1. Find : (i) heat energy needed to warm it by 150C, and (ii) its specific heat capacity in S.I unit.

(i)We know that heat energy needed to raise the temperature by 15ois = heat capacity × change in temperature. Heat energy required = 966JK−1×15K=14490J.(ii)We know that specific heat capacity is = heat capacity/ mass of substanceSo specific heat capacity is = 966 / 2 = 483Jkg−1K−1.

A piece of iron of mass 2.0 kghas a heat capacity of $966 J K^{- 1}$ . Find : (i) heat energy needed to warm it by $15^{0} C$ , and (ii) its specific heat capacity in S.I unit.