Which of the following equations is used to calculate the standard enthalpy change of a reaction $(\Delta_r H^\circ)$?
- A$\Delta_r H^\circ = \sum \Delta_f H^\circ(\text{products}) - \sum \Delta_f H^\circ(\text{reactants})$
- B$\Delta_r H^\circ = \sum \Delta_f H^\circ(\text{reactants}) - \sum \Delta_f H^\circ(\text{products})$
- C$\Delta_r H^\circ = \sum \Delta_f H^\circ(\text{products}) + \sum \Delta_f H^\circ(\text{reactants})$
- D$\Delta_r H^\circ = \frac{\sum \Delta_f H^\circ(\text{products})}{\sum \Delta_f H^\circ(\text{reactants})}$
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