How many moles of magnesium phosphate, Mg3PO42 will contain 0.25 mol 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
One mole of Mg3PO42 contain 3 mol of Mg atoms, 2 mol of P atoms and 2 x 4 (= 8) mol of oxygen atoms8 mol atoms of oxygen are present inMg3PO42=1mol0.25 mol atoms of oxygen are present inMg3PO42=18×0.25=3.125×10−2mol.