I can easily work out the molar mass of Ca3PO4 - but I do not see any reason to do this.
There is no such compound
If you want the molar mass of tricalcium phosphate , then the correct formula is Ca3(PO4)2 .
For purposes of calculating the molar mass it is easier to write: Ca3P2O8
Ca = 40.078g/mol *3 = 120.234g
P = 30.974g/mol *2 = 61.948g
O = 15.999g/mol *8 = 127.992g
Total = 310.174g/mol
Mass of 4.5 mol = 310.174g/mol *4.5mol = 1395.783g
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