Question

Calculate the amount of heat energy required to raise the temperature of $100g$ of copper from ${20}^{\circ }C$ to ${70}^{\circ }C$. Specific heat capacity of copper: $390Jk{g}^{-1}{K}^{-1}$.

• A. $195J$
• B. $3900J$
• C. $1950J$
• D. $390J$

Answer 1

The correct option is C $1950J$

Given : $m=0.1kg$ , $T_1={20}^{o}C$ , $T_2={70}^{o}C$ , $S=390$$Jk{g}^{-1}{K}^{-1}$

Heat required $H=mS(T_2-T_1)$

$\therefore$ $H=0.1\times 390(70-20)=1950J$