How many moles of magnesium phosphate, Mg₃(PO₄)₂ will contain 0.25 mole of oxygen atoms?
(a) 1.25 × 10⁻²
(b) 2.5 × 10⁻²
(c) 0.02
(d) 3.125 × 10⁻²
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the answer is
(d) 3.125×10^–²
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