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How many moles of magnesium phosphate Mg...

How many moles of magnesium phosphate` Mg _(3)(PO_(4))_(2)` will contain 0.25 mole of oxygen atoms ?

A

0.02

B

`3.125 xx 10^(-2)`

C

`1.25 xx 10^(-2)`

D

`2.5 xx 10^(-2)`

Text Solution

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The correct Answer is:
B
1 mole of `Mg_(3)(PO_(4))_(2) rArr` 3 moles of Mg atom + 2 moles of P atom + moles of O atom
8 moles of oxygen atoms are present in = 1 mole of `Mg_(3)(PO_(4))_(2)`
0.25 mole of oxygen atoms are present in `= (1 xx 0.25)/(8) = 3.125 xx 10^(-2)` moles of `Mg_(3)(PO_(4))_(2)`
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