# What is the molar mass of Ca_3(PO_4)_2?

Feb 4, 2017

Can you tell me the molar mass of ATOMIC calcium, phosphorus, and oxygen?

#### Explanation:

In fact you can do this, because you do have access to a Periodic Table, and the atomic masses are printed on the Table. All scientists use the Table daily to assign molecular masses.

And the atomic mass of calcium metal is $40.1 \cdot g \cdot m o {l}^{-} 1$, of phosphorus it is $31.00 \cdot m o {l}^{-} 1$, of oxygen it is $15.99 \cdot g \cdot m o {l}^{-} 1$.

And to determine the molecular mass, all I do is appropriately sum these atomic masses: $\left(3 \times 40.1 + 2 \times 31.0 + 8 \times 16.00\right) \cdot g \cdot m o {l}^{-} 1$, and what do you get?