HELP Percent Yield!
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HELP Percent Yield!

[From: ] [author: ] [Date: 12-06-08] [Hit: ]
00g of AlPO4 is produced. What is the percent yield for this reaction?X = 0.0.333 = 40.So theoretical yield is 40.......
I can't figure this out and it's bothering me!

When 9.00g of Al reacts with an excess of H3PO4, 30.00g of AlPO4 is produced. What is the percent yield for this reaction?

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1 mole Al = 27g
X = 9g
X = 0.3333

I mole AlPO4 = 27 + 31 + 16 + 16 + 16 +16
1 mole = 122g
0.333 = 40.626g

So theoretical yield is 40.626g
We made 30g
Percentage yield = what we got/what we should have got
=30/40.626 x100%
= 73.8%

Hope that makes sense?
The limiting reagent (the one that's not in excess) determines the molarity of the product!

Good luck :)
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