What are the empirical formulas of substances with the followingmass percent compositions?
(a) aspirin 4.48% H, 60.00% C, 35.52% O
(b) ilmenite (a titanium-containing ore) 31.63% O, 31.56% Ti,36.81% Fe
(c) sodium thiosulfate (photographic \"fixer\") 30.36% O, 29.08%Na, 40.56% S
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