Mass fraction of sulfur in sulfurous acid.

To do this, we calculate the molecular weight of the sulfurous acid molecule – 2 * 1 + 32 + 16 * 3 = 82, then multiply the atomic mass of sulfur -32 by the number of its atoms -1 = 32, and divide by the molecular weight. 32/82 = 0.3902 or 39.02%.



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