How many moles of magnesium phosphate, Mg₃(PO₄)² will contain 0.25 mole of oxygen atoms?

0.02

3.125 × 10^–2

1.25 × 10^–2

2.5 × 10^–2

Solution

3.125 × 10^–2

Mg subscript 3 left parenthesis PO subscript 4 right parenthesis subscript 2 apostrophe straight n apostrophe space moles 8 straight n space equals space 0.25 straight n space equals space fraction numerator 0.25 over denominator 8 end fraction space equals space fraction numerator 25 over denominator 8 space straight x space 100 end fraction space equals space 3.125 space straight x space 10 to the power of negative 2 end exponent

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