Posted by Husen on Wednesday, July 13, 2011 at 7:28am.
3.1 g P is how many moles P? moles = g/molar mass.
There are two moles P atoms per mole Ca3(PO4)2 and 3 moles Ca atoms per mole Ca3(PO4)2, then 1/2 P moles will be moles Ca3(PO4)2 and 3x that value will be moles Ca atoms.
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