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posted by  tored ryan on 8/27/2008 5:51:41 PM  |  status: Live  

Help! Webassign problem. lifesaver's on

Course Textbook Chapter Problem
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Question Details:
How many moles and grams of carbon are present in 17.3 g of ibuprofen, C13H18O2. Use the following atomic masses: C=12, H=1, O=16
mol C

g C
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Sage
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posted by kwyjibo on 8/27/2008 6:40:54 PM  |  status: Live
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tored ryan's comment:
"Thanks a lot!"
Response Details:
MW of ibuprofen:
13*12 + 18*1 + 2*16 = 206 g/mol

17.3 g *(1mol/206g)*(13 mol C/1mol ibuprofen) = 1.09 mol C

1.09 mol C*(12 g C/1mol C) = 13.08 g C
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posted by Kaiouji on 8/27/2008 6:53:25 PM  |  status: Live
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tored ryan's comment:
"Thanks!"
Response Details:
we can calculate the moles and grams of Carbon by...

stoichoimetry

1.09 moles of Carbon
then take 1.09 mol C x (molar mass) =13.08 g Carbon
Oracle
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posted by CHEMNATION! on 8/27/2008 6:58:58 PM  |  status: Live
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tored ryan's comment:
"Thanks!"
Response Details:
I agree with both posters except the significant figures should only be 3 in the second answer, or 13.1 g C.
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