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Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am


Postby Sophia Dinh 1D » Wed Jan 29, 2020 10:29 am

how can you use density in PV=nRT?

Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

Re: density

Postby VioletKo3F » Wed Jan 29, 2020 11:19 am

Since density is mass over volume, you can substitute the mass in n and the volume in v in the equation pv = nrt. Once this is done, the equation can be rewritten as molar mass = dRT/P.

Michelle N - 2C
Posts: 117
Joined: Wed Sep 18, 2019 12:19 am

Re: density

Postby Michelle N - 2C » Mon Feb 10, 2020 8:48 am

The density can be used toward PV=nRT when there are problems that doesn't give you the moles of the molecule. For example, a problem might give you the amount in mL, and so we'd convert it to moles via density (at least that's what I've been told through the sessions). Hope that helps!

Hannah Romeo 1J
Posts: 58
Joined: Thu Jul 11, 2019 12:16 am

Re: density

Postby Hannah Romeo 1J » Mon Feb 10, 2020 9:30 am

Density is mass/volume (g/cm^3) and can be substituted into the ideal gas equation using algebra.

Aarushi Solanki 4F
Posts: 107
Joined: Sat Jul 20, 2019 12:17 am

Re: density

Postby Aarushi Solanki 4F » Mon Feb 10, 2020 10:08 am

Density is given in g/mL. Sometimes, the problem gives the amount of a substance in mL, and you can convert this value to grams and then moles to find the 'n' in PV=nRT.

Juliana Chopelas 1A
Posts: 50
Joined: Sat Aug 24, 2019 12:16 am

Re: density

Postby Juliana Chopelas 1A » Sun Feb 16, 2020 3:08 pm

You can use density to find "n" or even replace "n" in PV=nRT since density is mass/volume

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