Given the following reactions and their enthalpies: ----------------------------

Question

Given the following reactions and their enthalpies:

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I just started biochemistry, a class that assumes I remember these basic chemistry fundamentals...which I never really learned in the first place. I'm a Biology major specifically because my premed choices were that or chem, and chem was too hard:/ I have an answer from the text, but would really appreciate any help explaining it in a way a novice student taking a crash course could understand. Please, any advice geared toward struggling chemistry students in my position in addidtion to the answer to the above is greatly welcomed. Thank You:)

Explanation / Answer

let the reactions be numbered as 1,2,3 and 4 respectively from up to down

Then
reaction 4= reaction 1 +0.5 reaction 2 - reaction 3

so,
delta H= delta H1 + 0.5delta H2 - delta H3
        = 436 + 0.5 * 495 - (-242)
        = 925.5 KJ/mol

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