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pyone1517
Joined: 24 Nov 2007
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 Posted: Sun Jan 27, 2008 9:50 am Post subject: Moles/fraction problem |
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39) A sample of white phosphorus was reacted with excess Cl2 gas to yield 68.75 grams of phosphorus trichloride. How many discrete P4 molecules were there in the sample?
0.75 x 1023
1.50 x 1023
3.00 x 10-23
2.40 x 10-23
Answer is A, but I got lost after figuring out the mole fraction. I divided Mass yield over Total MW of phosphorus trichloride. I don't know where to go from there, please help! |
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admin
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Joined: 08 Dec 2003
Posts: 2176
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| Posted: Sun Jan 27, 2008 9:12 pm Post subject: |
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| Hello. What is the origin of this question? If it is from one of the GS MCAT CBTs, then this question should be posted in that thread. Thanks for your understanding. |
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