Chapter 9, Problem 122CP

(a)

Interpretation Introduction

Interpretation:

The change in the gas when the valve is open needs to be explained. Also, the changed value needs to be calculated.

Concept Introduction : The ideal gas equation is represented as follows:

  $PV=nRT$

Here, P is pressure, V is volume, n is number of moles, R is Universal gas constant and T is temperature.

(b)

Interpretation Introduction

Interpretation:

The value of $\text{ΔH, ΔE , q and w}$ needs to be calculated for the process.

Concept Introduction :

The relation between $\text{ΔH, ΔE , q and w}$ is as follows:

  $\Delta E=q+w$

And,

  $\Delta H=nCp\Delta T$

And,

  $w=-P\Delta V$

Here,

q is heat, w is work done, n is number of moles, Cp is heat capacity at constant pressure, $\Delta T$ is change in temperature, P is pressure and $\Delta V$ is change in volume.

(c)

Interpretation Introduction

Interpretation:

The driving force for the process needs to be calculated.

Concept Introduction :

The relation between $\text{ΔH, ΔE , q and w}$ is as follows:

  $\Delta E=q+w$

And,

  $\Delta H=nCp\Delta T$

And,

  $w=-P\Delta V$

Here,

q is heat, w is work done, n is number of moles, Cp is heat capacity at constant pressure, $\Delta T$ is change in temperature, P is pressure and $\Delta V$ is change in volume.