How do I calculate the molar mass on the following?
a) Ca(PO₄)₂
b) C₄SO₄ x 5H₂O
c) (NH₄)₂SO₄ x 12H₂O

Just add the atomic masses of each atom present in them.

I'll do the first one.

Ca(PO₄)₂ : Molar mass = 40 + 2(31+16+16+16+16) = 198 g

You have the required masses in the periodic table.

If you have water, add them too.

Try the rest and post your answers.