Chapter 15, Problem 15.54P

Interpretation Introduction

Interpretation:

The nutritional calorie that is expended by body in melting snow to make a liter of water has to be determined.

Concept Introduction:

Molar enthalpy for a process is amount of heat energy needed by $1\text{mol}$ of a substance to undergo change in the process. The heat energy absorbed by $n\text{mol}$ of substance to undergo change is as follows:

  $q=n\left(\Delta H\right)$

Here,

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

$n$ is moles of substance.

$\Delta H$ is the enthalpy for process in $\text{kJ/mol}$ .

The value of $\Delta H$ is positive always as energy needed to overcome the interactions between the liquid molecules.