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Write the equation and balance it.
3CaCl2 + 2Na3PO4 ==> Ca3(PO4)2 + 6NaCl
mols Ca3(PO4)2 = grams/molar mass
Convert mols Ca3(PO4)2 to mols CaCl2 using the coefficientsin the balanced equation.
Then mols CaCl2 = grams CaCl2 x molar mass CaCl2