Chapter 4, Problem 4.4CP

Interpretation Introduction

Interpretation: Whether the enthalpy of formation of liquid water changes if the absolute enthalpies of hydrogen and oxygen gas are taken as 100 kJ/mol, not zero. Similarly, whether change in standard enthalpy of reaction of liquid water and carbon dioxide gas to give hydrogen carbonate changes or remain the same.

Concept Introduction: For a general reaction as follows:

  $A\left(g\right)\to B\left(g\right)+C\left(g\right)$

The change in enthalpy of the reaction can be calculated as follows:

  $\Delta H_R=\Delta H_f\left(B\left(g\right)\right)+\Delta H_f\left(C\left(g\right)\right)-\Delta H_f\left(A\left(g\right)\right)$