Chapter 17, Problem 8STP

Interpretation Introduction

Interpretation:

To calculate the heat absorbed in region C for ammonia.

Concept Introduction :

When matter transitions from one state (solid, liquid, gas, or plasma), it goes through a phase shift. Both when the pressure on the system changes and when enough energy is added to (or taken away from) the system, these changes take place.

Answer to Problem 8STP

  $23.3\text{ kJ}$

Explanation of Solution

In region C, an only phase transition occurs from liquid to gas. So, heat absorbed will be equal to enthalpy of vaporization.

The enthalpy of vaporization for ammonia is $23.3\text{kJ}/\text{mol}$ /

No. of mol given is 1 mol.

Thus, heat absorbed will be $23.3\text{ kJ}$