Question

Q1. Calculate the formula mass of Ca3(PO4)2, commonly called calcium phosphate. (Relative atomic mass: Ca= 40, P= 31, O= 16)

Answer 1

Give,

Mass of:

Ca = 40 , P = 31 , O = 16

To Find,

Mass of Ca3(PO4)2

Solution,

Mass of Calcium Phosphate:

==> 40×3 + (31 + 16×4)×2

==> 120 + (64+31)×2

==> 120 + 95×2

==> 120 + 190

==> 310 g

Hence, Mass of Calcium phosphate is 310 g

Answer 2

Given,

The atomic mass of Ca = 40 gm

The atomic mass of  P  = 31 gm

The atomic mass of  O = 16 gm

To find,

We have to find the formula mass of Ca₃(PO₄)₂.

Solution,

The formula mass of Ca₃(PO₄)₂ is 310 gm.

Formula mass of Ca₃(PO₄)₂  = 3 Ca +2P +8O

                                              = 3(40) + 2(31) +8(16)

                                              = 120 + 62 + 128

                                              = 310 gm

Hence, the formula mass of Ca₃(PO₄)₂ is 310 gm.