Chapter 9, Problem 114AE

Interpretation Introduction

Interpretation: The $\Delta \text{H}$ value for the following reaction needs to be determined:

  ${\text{N}}_{\text{2}}{\text{H}}_{\text{4}}{\text{(l) + O}}_{\text{2}}\text{(g) }\to {\text{ N}}_{\text{2}}{\text{(g) + 2H}}_{\text{2}}\text{O(l)}$

Concept Introduction:For the overall processes, the enthalpy change can be determined by adding the enthalpy change of all the steps involved in the process is known as Hess’s Law. The equation to show Hess’s law is:

  ${\text{ΔH}}_{\text{total}}{\text{= ΔH}}_{\text{1}}{\text{+ΔH}}_{\text{2}}{\text{+ΔH}}_{\text{3}}\text{+}\mathrm{...}{\text{+ΔH}}_{\text{n}}$