The magnesium in a sample of mineral water weighing 110.520 g is first converted to MgNH4PO4 and then to Mg2P2O7.The mass of Mg2P2O7 obtained is 0.0216 g.Express the quantity of magnesium in the mineral water in parts per million (that is in g Mg per 106 g H2O) .
A) 1.95 × 103 ppm
B) 8.95 ppm
C) 234 ppm
D) 42.7 ppm
E) 21.4 ppm
Correct Answer:
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