Question

What is the gram-formula mass of Ca3(PO4)2 ?

1) 355 g/mol
2) 340. g/mol
3) 310. g/mol
4) 275 g/mol

Answer 1

3) 310 g/mol

Step-by-step explanation:

Hello,

In this case, for calcium carbonate, we are able to compute its gram-formula mass by considering the atomic mass of each element composing it and their subscripts as shown below:

`M=3*m_(Ca)+2*m_P+4*2*m_O\\`

Thus, we compute:

`M=3*40g/mol+2*31g/mol+4*2*16g/mol\\\\M=310g/mol`

Hence answer is 3) 310 g/mol . Remember this is also known as the molar mass of the mentioned compound.

Best regards.