Question

Which of the following most closely resembles Hess's Law?A.) enthalpy is negative when a reaction is endothermicB.) reactions must be flipped if you want to find the enthalpy changeC.) chemical equations must always be balancedD.) the enthalpy change for a reaction equals the sum of the enthalpy changes of each of its steps

Answer 1

D) The enthalpy change for a reaction equals the sum of the enthalpy changes of each of its steps.

Step-by-step explanation:

Hess's Law explains that the enthalpy of a chemical reaction can be expressed as the sum of the enthalpies of the partial reactions that can occur to reach the main reaction.

For example, the sum of the previuos exercise:

`\Delta H_A=\Delta H_B+\Delta H_C`