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Eugene S.
University of Minnesota - Twin Cities

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Problem 88 Medium Difficulty

Ethanol can be made from the fermentation of crops and has been used as a fuel additive to gasoline. Write a balanced equation for the combustion of ethanol and calculate Hrxn.

Answer

$-1277.6 \mathrm{~kJ} / \mathrm{mol}$

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Video Transcript

So this question wants us to write a balanced equation for the combustion of ethanol and find the delta h of reaction. And so our combustion of ethanol equation begins with ethanol ch three ch two old H gas we add in our oxygen three of them, and then form to co two gas and three h two o gas. And now this equation is complete and balanced. And so now we need to find our delta h knots of formation. So ethanol see to H five o h. Gas has a delta h not information off two. Thirty four point eight killed. Jules, promote our delta h not formation off our O two gas is zero our delta h, not a formation off our CEO to gas is negative. Three ninety three point five. Kill Jules promote and our adult h not a formation off our H two o gas is negative to forty one point eight killer jewels from all. And so now we confined the delta h of reaction by just taking our Delta H products minus our delta h reactant ce. And so our products are two times the co two delta h not a formation plus three times the H two o Delta H not a formation and then minus R. One reactant. That is not zero R ethanol is two thirty four point eight negative two thirty four point eight kilograms per mall. And when you combine all these together we get twelve seventy seven point six, killing joules per mall as the final delta h not of reaction.

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