Chapter 4, Problem 4D.6E

Interpretation Introduction

Interpretation:

The change in enthalpy, $\Delta H$ of the reaction is to be determined.

Concept Introduction:

The change in enthalpy of a certain reaction is represented by $\Delta H$.  The enthalpy of a system is the total heat content in it at constant pressure. It is numerically equal to the sum of the product of pressure ($P$) and volume ($\Delta V$) and the change in internal energy ($\Delta U$).  $P\Delta V$ is the work done. If work is done on the system, then the sign of $P\Delta V$ would be negative. Conversely, if the system does work on the surroundings, then the sign of $P\Delta V$ would be positive and it is said that positive work is done.