Chapter 6, Problem 6.81P

(a)

Interpretation Introduction

Interpretation: The work done by the expanding gas in joules is to determined.

Concept Introduction: Work done by an expanding gas is the equal to the energy shifted to the surrounding.

To determine initial and final volumes of gas at different temperatures by using ideal gas law:

  $PV=nRT$

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 temperature change when the gas is heated by using the equal quantity of energy in a container of fixed volume is to be calculated.

Concept Introduction: Heat is an energy which flows in or out of a system due to change in temperature between system and surroundings. Relation between heat and temperature change is quantity of heat.

  $\text{q}\text{=}\text{mcΔT}$

Here m is mass of sample, q is heat, c is specific heat of the sample

  $\Delta \text{T}$ is change in temperature.