Algebra


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Ricky Ma DIS 4E
Posts: 72
Joined: Fri Sep 28, 2018 12:27 am

Algebra

Postby Ricky Ma DIS 4E » Thu Jan 10, 2019 12:24 am

Can someone explain to me how P=(Conc)RT becomes Conc=P/RT? And for clarification P stand for partial pressure right?

Tarika Gujral 1K
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: Algebra

Postby Tarika Gujral 1K » Thu Jan 10, 2019 9:27 am

Concentration is n (mol) / V (L)

Given the ideal gas law: PV = nRT
We write P = (n/V)RT
Thus P = (Conc)RT

Then to determine concentration, we divide P by RT
And get P/RT = Conc

ThomasLai1D
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

Re: Algebra

Postby ThomasLai1D » Thu Jan 10, 2019 9:28 am

By dividing P=(conc)RT by RT, the resulting equation would be P/RT=conc. I do not think P is necessarily restricted to partial pressures, just that it represents pressure in the formula.

Cynthia Aragon 1B
Posts: 47
Joined: Mon Apr 09, 2018 1:38 pm

Re: Algebra

Postby Cynthia Aragon 1B » Thu Jan 10, 2019 10:10 am

For a gas we use its partial pressure (P).

To convert between concentration and pressure you use the ideal gas law: PV= nRT

To ultimately get concentration, first divide by "V" on both sides of the equation to get P=(n/V) RT

n/V stands for mole/V or mol/L

Then P= conc (RT)

To get concentration by itself divide by (RT) on both sides of the equation to get P/RT = concentration

Brianna Brockman 1F
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: Algebra

Postby Brianna Brockman 1F » Thu Jan 10, 2019 11:20 am

P=(conc)RT becomes Conc=P/RT like this:

Becasue you want to get Conc alone, you divide both sides by RT. This makes RT cancel out on the side of concentration.

now you have Conc=P/RT

Madeline Motamedi 4I
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Algebra

Postby Madeline Motamedi 4I » Fri Jan 11, 2019 2:32 pm

A tip for converting this is you can actually set each of those to different variables that you assign on your own so you can see what's going on more easily. Then when you're done convert the variables back. Try doing this once so you can see the process clearly then you should be good!


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