## Practice Midterm #3b Equation

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Alexia Joseph 2B
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Joined: Thu Jul 27, 2017 3:01 am

### Practice Midterm #3b Equation

What equation do you use to find the final pressure after knowing the total volume is 11.0L in #3 of the practice midterm (where delta S was 33.0 J/K)?

Alvin Tran 2E
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Joined: Fri Sep 29, 2017 7:06 am

### Re: Practice Midterm #3b Equation

PV = nRT

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### Re: Practice Midterm #3b Equation

How would you use the equation to solve for pressure?

Alvin Tran 2E
Posts: 39
Joined: Fri Sep 29, 2017 7:06 am

### Re: Practice Midterm #3b Equation

V = 11 L is given. n equals the sum of the He and Kr moles. It should be around 3.74 moles. R is the gas constant. T is the final temperature in K which is 75.0 + 273.15 = 348.15 K. Plug in and solve for P.