Partial Pressures for Different Temperatures

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Harmony Becerra
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Joined: Sun Jan 21, 2018 3:00 am

Partial Pressures for Different Temperatures

Postby Harmony Becerra » Tue Jan 08, 2019 10:11 pm

For 5G.9 it asks whether the partial pressures will be the same in both containers when the second container has a higher molarity. I have the answer key and it says the partial pressures will be different, but I don't understand why. If each container is held at the same temperature, wouldn't the partial pressures stay the same? Or does it change because the molarity changes, and if so, why?

Venya Vaddi 1L
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Joined: Fri Sep 28, 2018 12:16 am
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Re: Partial Pressures for Different Temperatures

Postby Venya Vaddi 1L » Wed Jan 09, 2019 2:24 pm

In the second container, since the concentration of O2 is greater the partial pressure is greater. Pressure and concentration are directly proportional as shown by P=(conc.)RT, so if concentration is greater, then pressure is also greater (given that T is the same).

Anusha 1H
Posts: 65
Joined: Fri Sep 28, 2018 12:15 am

Re: Partial Pressures for Different Temperatures

Postby Anusha 1H » Wed Jan 09, 2019 3:02 pm

Molarity and Partial Pressure are directly related.
We can tell from PV=nRT when the equation is written
- (n/V) = P/(RT) or
- concentration = P/(RT)
that when the pressure increases the concentration will also increase.


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