Concentration vs. Pressure?

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Ben Rolnik 1D
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Joined: Fri Jun 23, 2017 11:39 am

Concentration vs. Pressure?

Postby Ben Rolnik 1D » Sun Jul 23, 2017 5:57 pm

Can someone please explain when we actually use the ideal gas equation?

It seems like most of the problem in the book let you set up the ICE box using pressure without needing to convert it into a concentration... so I'm a bit confused about when we will need to convert partial pressure to molarity using (P/RT) = n/v.

Thanks!

Chem_Mod
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Re: Concentration vs. Pressure?

Postby Chem_Mod » Sun Jul 23, 2017 7:48 pm

Correct, most of the time PV = nRT is not used in an equilibrium problem.

However, when a gas is involved in a reaction and the reaction also involves a solution, then PV = nRT may be needed if the amount of gas is given in atm (pressure).
If so, use P/RT = n/v to convert the pressure to concentration.

Ask me after class or in office hours if needed.

Ben Rolnik 1D
Posts: 33
Joined: Fri Jun 23, 2017 11:39 am

Re: Concentration vs. Pressure?

Postby Ben Rolnik 1D » Sun Jul 23, 2017 8:23 pm

Got it! Will do :) Thanks!

Xinye_Jiang_1A
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Re: Concentration vs. Pressure?

Postby Xinye_Jiang_1A » Sun Jul 23, 2017 8:49 pm

T is given by Kelvin right?

Ben Rolnik 1D
Posts: 33
Joined: Fri Jun 23, 2017 11:39 am

Re: Concentration vs. Pressure?

Postby Ben Rolnik 1D » Sun Jul 23, 2017 9:02 pm

Yes :)


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