## 6th edition 8.31

$w=-P\Delta V$
and
$w=-\int_{V_{1}}^{V_{2}}PdV=-nRTln\frac{V_{2}}{V_{1}}$

Tyra Nguyen 4H
Posts: 74
Joined: Fri Sep 28, 2018 12:25 am

### 6th edition 8.31

8.31 Calculate the heat released by 5.025 g of Kr(g) at
0.400 atm as it cools from 97.6 oC to 25.0 oC at (a) constant pressure and (b) constant volume. Assume that krypton behaves as an ideal gas.

I don't really know where to start with this problem or what equations to even use.

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

### Re: 6th edition 8.31

Treat this problem as you would any heat capacity problem. You should be using the relations $q_{p}=nC_{p}\Delta T$ and $q_{v}=nC_{v}\Delta T$ just as you would use the equation $q=mC_{s}\Delta T$ for ordinary heat capacity problems. You can find the equations for Cp and Cv on the equation sheet.

Nicolette_Canlian_2L
Posts: 77
Joined: Fri Sep 28, 2018 12:25 am
Been upvoted: 1 time

### Re: 6th edition 8.31

I was stuck on the same question. So we have to convert the given mass of the krypton gas into moles and work from there?

Catly Do 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:24 am

### Re: 6th edition 8.31

Here's the worked out problem!
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