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Q.

How many moles of magnesium phosphate, Mg3(PO4)will contain 0.25 mole of oxygen atoms ?

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a

0.02

b

3.125 ×10-2

c

1.25×10-2

d

2.5×10-2

answer is B.

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Detailed Solution

1 mole of Mg3(PO4)2 contains 8 mole atoms of O-atoms 

                             ?   =            0.25 mole O-atoms

=0.258=3.125 ×10-2

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