Calculate the mass fraction of oxygen in the H3PO4 substance.

univerkov | March 18, 2021 | education

M (H3PO4) = 1 * 3 + 31 + 16 * 4 = 3 + 31 + 64 = 98 g / mol W (H) = (3/98) * 100% = 3% W (P) = (31/98) * 100% = 31.7% W (O) = 100 – 3.06 – 31.6 = 65.3%
Answer: 65.3%

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