Select the mass fraction of oxygen in the following compound Ca3 (PO4).
| August 5, 2021 | education
1. Calculate the relative molecular weight of calcium phosphate:
Mr (Ca3PO4) = 3 * Ar (Ca) + Ar (P) + 4 * Ar (O) = 3 * 40 + 31 + 4 * 16 = 215;
2.Calculate the mass fraction of oxygen in phosphate:
w (O) = 4 * Ar (O): Mr (Ca3PO4) = 4 * 16: 215 = 0.2977 or 29.77%.
Answer: 29.77%.
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