Calculate the mass fractions of oxygen in Al2 (SO4) 3.

univerkov | September 29, 2021 | education

1. Determine the relative molecular weight of aluminum sulfate:

Mr (Al2 (SO4) 3) = 2 * Ar (Al) + 3 * Ar (S) + 3 * 4 * Ar (O) = 2 * 27 + 3 * 32 + 12 * 16 = 342;

2.Calculate the mass fraction of oxygen in sulfate:

w (O) = 4 * 3 * Ar (O): Mr (Al2 (SO4) 3) = 192: 342 = 0.5614 or 56.14%.

Answer: 56.14%.

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