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1) A compound that contains only carbon, hydrogen, and oxygen is 48.4 % C and 8.12 % H by mass. What is the empirical formula of the substance?

C2H6O2
C2H5O
C3H6O2
C3H6O
CH5O2
C3H5O2
C3H4O2
C2HO

2)The active ingredient in photographic fixer solution contains sodium, sulfur, and oxygen. Analysis of a sample shows that the sample contains 0.97 g of Na, 1.365 g of S, and 1.021 g of O. What is the empirical formula of the substance?

NaS2O3
Na2S2O2
Na2S2O
NaS2O2
NaSO4
Na2S2O3
Na2SO4
NaS2O4