Question

Hess's Law is used

• A. When a directly measured enthalpy change of reaction is not available
• B. To calculate an enthalpy change value through multiple steps
• C. Because enthalpy is a State Function
• D. As an easy way to calculate the enthalpy change of a reaction
• E. All of these options(A,B,C,D) are correct

Answer 1

The correct option is E All of these options(A,B,C,D) are correct

All of these options are correct.
Hess's Law is used
A) When a directly measured enthalpy change of reaction is not available
B) To calculate an enthalpy change value through multiple steps
C) Because enthalpy is a State Function
E) As an easy way to calculate the enthalpy change of a reaction
According to Hess Law, the change in enthalpy for a reaction is the same whether the reaction takes place in one or more steps. The Hess's law can also be stated as the enthalpy change for a chemical reaction is the same regardless of the path followed by the reaction.