Question

The formula unit mass of Ca3 (PO4)2 is ————.

Answer 1

Hi

Formula of unit mass Ca3(PO4)2
Atomic mass
Ca = 40.07
P = 30. 9
O = 16

So

Ca3(PO4)2 = 40.07x3+2×30.9+4×16

=310.0176722g/mol

Answer 2

The formula unit mass of $Ca_3 (PO_4 )_2$ is 310.176722 g/mole.

Solution:

Formula of unit mass $Ca_3 (PO_4 )_2$

Atomic mass of Ca = 40.07,

P = 30. 9,

O = 16.

So,

$\begin{array}{l}{\text {Unit mass }=(\text {Number Calcium atoms } \times \text { atomic mass of Calcium) }+} \\ {\text { (Number Phosphorus atoms } \times \text { atomic mass of Phosphorus) + (Number Oxygen atoms x } \\ {\text { atomic mass of Oxygen) }}\end{array}$

$\begin{array}{l}{=(3 \times 40.07)+(2 \times 30.9)+(8 \times 16)} \\ \\{=120.21+61.8+128}\end{array}$

= 310.01767

Formula unit mass of Calcium phosphate = 310.0176722 g/mole.

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