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Eugene S.
University of Minnesota - Twin Cities

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Problem 84 Hard Difficulty

Pentane (C5H12) is a component of gasoline that burns according to the following balanced equation:

Calculate Hrxn for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of liquid pentane is -146.8 kJ>mol.)

Answer

$-3271.1 \mathrm{~kJ} \mathrm{~m}$

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Phimdao S.

October 6, 2021

how did you find out the delta H formation for O2,Co2 and H2O ?

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Video Transcript

So in this problem, we're given the equation. C five age twelve liquid plus eight Oh, two gas form's five, OOO to gas plus six h two o gas. And this is the combustion of plantain. And so we want to find the delta h of reaction using Delta Ages of formation. And so were given the delta H of formation of C five h twelve liquid, and that is given to us as negative one. Forty six point eight killed. Jules Permal Thie Delta H of formation of O two gas is zero killer Jules Pramono, and then the Delta H of formation of our products Go to gas is negative. Three ninety three point five one Kill Jules Permal and finally, the Delta H of formation off our product, H two o gas is negative to forty one point eight two six killed Jules per mall. And so now that we have all of these, we can add these together in a product's minus reactant ce weigh in and so that we can get the delta h of reaction. And so how we do this is our delta h of reaction is equal to the sum off the Delta H of products minus the Delta Age of React in CE. And so now we can plug in our values. We have five times the Delta H of CO two plus six times the Delta Age of H two o minus the Delta H of C five, h twelve and then we don't need to include the O two, since that is simply zero. And so now we can plug in our values. We have negative three ninety three point five one for Theo, too. We have negative to forty one point eight two six for H two o and we have negative one, forty six point eight for C five, age twelve. And so when we combine all these, we get that our final answer is negative. Three thousand two hundred seventy one point seven. Kill Jules pra mole. And that is our final answer for a Delta H of reaction

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