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So I think I have done this problem right, I was just wondering if anyone would check over it for me.

What mass (in grams) of P2O5 contains 1.20 x 1023 atoms of phosphorus?

1.20E23 atoms of P x (1 mol/ 6.022E23 atoms) x (5 mol O/ 2 mol P) x (1 mol P2O5/ 5 mol O) x (79.995g/ 1 mol P2O5) =

7.97g of P2O5

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I don't understand why you went through the oxygen link; however, one factor canceled the other so no harm done except for extra work. The only error I see is the molar mass P2O5 should be 141.94 grams instead of 79.995.

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