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In this question, you would still perform Hess's Law as usual but the enthalpy of the reaction obtained is for the reaction as written. In this case, the enthalpy of reaction is for 3 moles of C (gr) reacted. To find the enthalpy change for 4 moles of C (gr), you would divide by 3 moles and then multiply by 4 moles of C(gr).
I solved this by changing the reaction so that I would have 4 moles of C instead. I multiplied the entire reaction by 4/3 to get 4 C (graphite) + 16/3 H2 (g) --> 4/3 C3H8 (g). And then I did Hess's Law according to the new equation with the 4 moles of C.
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