## 8.31

Mitch Mologne 1A
Posts: 74
Joined: Fri Sep 29, 2017 7:04 am

### 8.31

I am struggling a bit on problem 8.31. Could someone explain how to approach this question?

Mitch Mologne 1A
Posts: 74
Joined: Fri Sep 29, 2017 7:04 am

### Re: 8.31

part b

Sabah Islam 1G
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

### Re: 8.31

For this question, you would use the equation q=mol*c*delta T. You would convert the mass of Krypton in order to find the moles of Krypton. You already have the change in temperature, so the only thing we would need to find is the specific heat capacity of krypton, being an ideal gas, at constant pressure and constant volume. You would do this by looking up the specific heat capacity of an ideal gas, given in the constants and equations sheet provided by Dr. Lavelle. The specific heat capacity of an ideal gas at constant pressure is (5/2)R and at constant volume is (3/2)R. R would be the gas constant, being 8.314 J*K^-1*mol^-1. From there, you have the values of moles, specific heat capacity, and delta T, so you can plus those into the equation and solve for q. Hope this helps :)

AlyssaPeckham1A
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

### Re: 8.31

To solve part b you would start with the equation Cvm=3/2*R to get the heat capacity at constant volume. I got 12.47 J/mol for Cvm. Then you would plug in the value you got for Cvm and your other known variables into the equation q=m*C*delta T to solve for the heat released.

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