Question

Consider the reaction pathway graph below.

Which statement best describes this graph?
This is an exothermic reaction with a positive ΔHrxn.
This is an exothermic reaction with a negative ΔHrxn.
This is an endothermic reaction with a positive ΔHrxn.
This is an endothermic reaction with a negative ΔHrxn.

Answer 1

C

Step-by-step explanation:

edg 2020

Answer 2

This is an endothermic reaction with a positive ΔHrxn.

Step-by-step explanation:

From the question given above, we can see clearly that the energy of the product (Hp) is greater than the energy of the reactant (Hr). This simply means that the reaction is endothermic as the enthalpy change (ΔH) for the reaction will be positive.

Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)

ΔH = Hp – Hr = positive

NOTE: A reaction with positive enthalphy change (ΔH) is termed endothermic reaction.