J.R. S. answered 04/18/18
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The formula for sulfurous acid is H2SO3
Percent oxygen (O) = mass O/total mass (x100%)
2H = 2x1 = 2
1S = 1x31 = 32
3O = 3x16 = 48
Total = 82
% Oxygen = 48/82 (x100%) = 58.5%