Homework Help: Chemistry

Posted by Chopsticks on Wednesday, March 18, 2009 at 11:18pm.

A sample of Oxygen has occupies 1.00x10^6mL at 575mm Hg is subjected to a pressure of 1.25atm. What will the final volume of the sample be if the temperature is held constant

v2=(p1)(p2)/p2

I'll have to convert 1.25atm to mm first

1.25atm*760mm/1.0atm = 950. mm

V2=(575mm)(1.00x10^6mL)/950.mm

=6.05x10^5

Can you check my math and method?

Chemistry - Chopsticks, Wednesday, March 18, 2009 at 11:29pm
Also:

A gas has a volume of 450.0 mL. If the temperature is held constant, what volume would the gas occuply if the pressure were doubled?
Chemistry - Chopsticks, Wednesday, March 18, 2009 at 11:41pm
Okay, for the second part I got 1.80x10^3 mL
Chemistry - DrBob222, Thursday, March 19, 2009 at 12:14am
I worked the 1st problem a different way and obtained the same answer. For #2, if the pressure is doubled won't the volume be halved? And your answer isn't half of what you started with. Just to make the problem simple, however, if you want to do it with numbers, just put in 1 for P1 and 2 for P2.
Chemistry - Chopsticks, Thursday, March 19, 2009 at 12:21am
ohh i got 225.
Chemistry - DrBob222, Thursday, March 19, 2009 at 12:29am
That's much better.
Chemistry - Chopsticks, Thursday, March 19, 2009 at 12:30am
Thanks haha. I had that answer for my paper, but on part b, it asked for 1/4 of the orginial pressure. And if that was the case, then 1.80x10^3 mL would be correct?

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