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What si the molar mass of Pb3(PO4)2 in units of g/mol?

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Look up the atomic masses of Pb, P, and O
Multiply the atomic mass of Pb by 3.
Multiply the atomic mass of P by 2.
Multiply the atomic mass of O by 8.
Add the three values you got. That is the formula mass which you label "grams/mole".

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