Chapter 15, Problem 15.5P

Interpretation Introduction

Interpretation:

The heat energy released by hand to melt $5\text{g}$ of gallium has to be determined.

Concept Introduction:

Molar enthalpy for a process is the quantity of heat energy needed by one mole of a substance to undergo change in the process. The heat energy that changes the temperature of $m$ mass of substance from $T_1$ to $T_2$ is as follows:

  $q=mC\left(T_1-T_2\right)$

Here,

$q$ is the heat energy in $\text{kJ}$

$m$ is the mass of substance.

$C$ is specific heat capacity of substance.

$T_1$ and $T_2$ are initial and final temperatures of substance respectively.