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Partial Pressures for Different Temperatures

Posted: Tue Jan 08, 2019 10:11 pm
by Harmony Becerra
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?

Re: Partial Pressures for Different Temperatures

Posted: Wed Jan 09, 2019 2:24 pm
by Venya Vaddi 1L
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).

Re: Partial Pressures for Different Temperatures

Posted: Wed Jan 09, 2019 3:02 pm
by Anusha 1H
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.