### Practice Midterm #3b Equation

Posted:

**Wed Feb 14, 2018 12:45 am**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)?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=133&t=27791

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Posted: **Wed Feb 14, 2018 12:45 am**

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)?

Posted: **Wed Feb 14, 2018 2:06 am**

PV = nRT

Posted: **Wed Feb 14, 2018 3:33 pm**

How would you use the equation to solve for pressure?

Posted: **Wed Feb 14, 2018 4:13 pm**

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.