In the gravimetric estimation of phosphorus, the compound is precipitated as Magnesium ammonium phos — Practical Organic Chemistry and Purification Chemistry Question
Question
In the gravimetric estimation of phosphorus, the compound is precipitated as Magnesium ammonium phosphate and ignited to yield $Mg_2P_2O_7$. What is the formula for the percentage of phosphorus?
Answer: B
💡 Solution & Explanation
The molar mass of $Mg_2P_2O_7$ is $222\text{ g/mol}$. It contains TWO phosphorus atoms, so the mass of P is $2 \times 31 = 62$. Thus, the mass fraction is $62/222$.
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