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February 28, 2015

February 28, 2015

Posted by **Annabella** on Wednesday, December 8, 2010 at 8:47pm.

Can somebody please explain how I figure this out? I'm so lost. :{

- Chemistry -
**DrBob222**, Wednesday, December 8, 2010 at 8:58pmI would use

(P1V1/T1) = (P2V2/T2) and solve for V2 at STP.

Then use PV = nRT to solve for n = number of moles of the gas. Since n = grams/molar mass, you know n and molar mass, one can solve for grams.

Finally, you know 1 mole of anything will contain 6.022E23 molecules. Use that piece of information to calculate the number of molecules.

- Chemistry -
**Annabella**, Wednesday, December 8, 2010 at 9:17pmThank you SOO much~! :D

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