Question

question 23 of 25 which of the following would be a good situation in which to apply hesss law? a. when the reaction is exothermic b. when the products are unknown c. when the $delta h_{reaction}$ is not known d. when a reaction is spontaneous

Explanation:

Hess's law is used to calculate the enthalpy change ($\Delta H$) of a reaction. It allows us to find $\Delta H_{reaction}$ when it cannot be measured directly by using known $\Delta H$ values of other reactions.

Answer:

C. When the $\Delta H_{reaction}$ is not known