Dividing by volume


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Ghadir Seder 1G
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Joined: Sat Sep 14, 2019 12:17 am

Dividing by volume

Postby Ghadir Seder 1G » Mon Jan 13, 2020 4:24 pm

When solving for pressure using the ideal gas equation, why don't we divide r and t by volume as well but only divide moles by volume?

Chem_Mod
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Re: Dividing by volume

Postby Chem_Mod » Mon Jan 13, 2020 4:33 pm

PV= nRT
the moles (n) are multiplied by the R and T. This means if you divide volume from both sides, you would be dividing the entire product of n, R and T by the volume V: P= (nRT)/V

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

Re: Dividing by volume

Postby Brian_Ho_2B » Mon Jan 13, 2020 4:34 pm

It really doesn't matter which value: n, R, or T, that you divide by the volume. Communitive rule of multiplication and division. Just make sure you divide by the volume only once, don't divide each value n, R, and T by volume and then multiply those together; that would be nRT/(v^3). You want P = nRT/V

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Re: Dividing by volume

Postby Ryan Chang 1C » Mon Jan 13, 2020 5:11 pm

It doesn't matter how you solve for pressure, however the most simple way is to just divide nRT by volume assuming that the problem gives you values for n, r, and t.


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