9.37 6th Edition

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Lauryn Shinno 2H
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Joined: Fri Sep 28, 2018 12:24 am

9.37 6th Edition

Postby Lauryn Shinno 2H » Sat Feb 09, 2019 9:19 am

Why are all the units J.K^-1.mol^-1? For example, in part d, I did [(3 mol)*(151.0 J.K^-1.mol^-1)+(1mol)*(82.59 J.K^-1.mol^-1)]-[(4 mol)*(143.1 J.K^-1.mol^-1)] which equals -36.81 J.K^-1.mol^-1. However, since you're multiplying mol by J.K^-1.mol^-1, shouldn't the units just be J.K^-1?

Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: 9.37 6th Edition

Postby jonathanjchang2E » Sat Feb 09, 2019 1:11 pm

The units of the coefficients for the reaction are not mols. "4 KClO3" may be 4 moles of KClO3 but the 4 by itself is not in mols"

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