How many moles of magnesium phosphate 'M...

How many moles of magnesium phosphate 'Mg_3(PO_4)_2' will contain 0.25 mole of oxygen atom?

A

0.02

B

`3.125xx10^(-2)`

C

`1.25xx10^(-2)`

D

`2.5xx10^(-2)`

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