Based on the diagram:

$\overline{){\mathbf{\u2206}}{{\mathbf{H}}}_{{\mathbf{X}}}{\mathbf{=}}{\mathbf{\u2206}}{{\mathbf{H}}}_{{\mathbf{Z}}}{\mathbf{+}}{\mathbf{\u2206}}{{\mathbf{H}}}_{{\mathbf{Y}}}}$

Consider the two diagrams below.

Based on (ii), write an equation relating H_{Z} to the other enthalpy changes in the diagram.

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