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March 1, 2015

Posted by **pooja** on Thursday, April 14, 2011 at 1:15pm.

Heres what i got but did not get the same answer..pls tell me where i am wrong!

(grams to moles)

19.7g x 1 mol/ 16.00 = 1.23 mol Oxygen

(Pv=nRT) looking for V

1.23 mol x 0.0821 x 273K / 1.00 atm = 27.57

CORRECT ANSWER is 13.8L!

- Intro to chem -
**DrBob222**, Thursday, April 14, 2011 at 5:20pmYou used the atomic weight of Oxygen and not the molar mass (molecular weight).

19.7/32 = 0.6156 moles

V = 0.6156*0.08206*273/ = 13.79L which rounds to 13.8L.

There is another way to do this which is a little easier if you remember that a mole of any gas occupies 22.4L at STP.

(19.7/32)*22.4 = 13.79 = 13.8L

- Intro to chem -
**Pooja**, Thursday, April 14, 2011 at 6:52pmThank you SO MUCH!

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