Posted by Michelle on Tuesday, December 11, 2012 at 11:34pm.
How many molecules of (NH4)3PO4.6H2O are in 4 mols of that stuff?
You know there are 6.02E23 molecules in 1 mol; therefore, there must be 4*6.02E23 molecules in 4 mols.
There are 10 atoms of O in 1 molecule of (NH4)3PO4.6H2O; therefore, there must be 10*4*6.02E23 atoms O in 4 mols of the stuff. Round to 3 significant figures and you get your answer.
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