Chapter 7, Problem 40E

Interpretation Introduction

Interpretation: The Internal energy of condensation of 1 mole of water should be calculated.

Concept Introduction:

• The Internal energy is a total energy of a system. Which is consists of kinetic, potential energies. The internal energy change is accompanies the heat flow or as work done on or by a system.

  Formula:

                                     $\text{ΔE=q}\pm \text{w}$ (1)

                                             q is a heat

                                            W is a work

Work done by the system means heat and work will be

                                      $\text{+q and -w}$

Work done on the system means heat and work will be

$\text{-q and +w}$

• The work is considered as a pressure and volume for the gases expansion and compressions in thermodynamic process.

• Formula:

                                          $\text{w}\text{=-P×ΔV}$ (2)

                                            W is work

                                            P is a constant external pressure

                                           $\text{ΔV}$ is a volume change