Question

how is hesss law used to calculate the enthalpy change of a reaction? a. the enthalpy changes of each step of the reaction are added together. b. the enthalpy of the products is subtracted from the enthalpy of the reactants. c. the enthalpy is determined experimentally using a bomb calorimeter. d. the enthalpy is calculated from the experimentally determined equilibrium constant.

Explanation:

Hess's law states that the enthalpy change of an overall reaction is the sum of the enthalpy changes of its individual steps. So, the enthalpy changes of each step of the reaction are added together.

Answer:

A. The enthalpy changes of each step of the reaction are added together.