What is the empirical formula of sulphur dioxide which contains 50% by mass of sulphur

Empirical formula is SO2.

Explanation:

So the fraction of Sulphur is 0.50 and the fraction of  oxygen is 0.50.

Dividing by the atomic masses of sulphur and oxygen:

S = .50 / 32 = 0.015625

O = .50 / 16 = 0.3125

Ratio of S: O =     0.015625/ 0.015625 to 0.3125/ 0.015625    

= 1:2.

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