b. how is the enthalpy of reaction related to the enthalpies of formation for the products and reactants? (1…

Brief Explanations:

The enthalpy of reaction ($\Delta H_{rxn}$) is calculated as the sum of the enthalpies of formation of the products ($\sum n\Delta H_f^{^{\circ}}(products)$) minus the sum of the enthalpies of formation of the reactants ($\sum m\Delta H_f^{^{\circ}}(reactants)$), where $n$ and $m$ are the stoichiometric coefficients of products and reactants respectively in the balanced - chemical equation.

Answer:

The enthalpy of reaction $\Delta H_{rxn}=\sum n\Delta H_f^{^{\circ}}(products)-\sum m\Delta H_f^{^{\circ}}(reactants)$