Step-by-step explanation:
The total enthalpy change of a reaction can be calculated like this:
total enthalpy change = potential energy of products - potential energy of reactants
If we take a look at the image we will see that the potential energy of the reactants is 50 kJ and the potential energy of the products is 100 kJ. Then the total enthalpy change is going to be:
potential energy of reactants = 50 kJ
potential energy of products = 100 kJ
ΔH = potential energy of products - potential energy of reactants
ΔH = 100 kJ - 50 kJ
ΔH = 50 kJ
Answer: The total enthalpy change is 50 kJ.