4.15 7th edition

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paytonm1H
Posts: 74
Joined: Fri Sep 28, 2018 12:18 am

4.15 7th edition

Postby paytonm1H » Sat Feb 09, 2019 9:56 pm

In the final step pf 4.15 in the solutions manual is said
-2000J=(-4.184 J/Cg)(800g)(deltaT)

I understand they are using the q(water) = -q(zinc oxidation) = mCp(deltaT)

Where are they getting the 800g water from?

Dimitri Speron 1C
Posts: 60
Joined: Fri Sep 28, 2018 12:17 am
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Re: 4.15 7th edition

Postby Dimitri Speron 1C » Sun Feb 10, 2019 1:54 pm

The density of water is 1g/mL and the question states that there are 800mL of solution. You can assume the contribution to density from dissolved solids is negligible and therefore that the weight of the water in question is 800g.


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