Could you post the question? It might be easier to help that way 
Original post by kiany
How do I calculate overall enthalpy change for a 3 stage reaction
W ==> X ==> Y ==> Z
Each step has an associated enthalpy change, w, x, and y
Then the total enthalpy change from W ===> Z is equal to (w + x + y)
This is Hess' law
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