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A compound contains 40% of Sulphur and 60% of Oxygen, what is the empirical formula of the compound?

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A compound contains 40% of Sulphur and 60% of Oxygen, what is the empirical formula of the compound?

(a) SO2

(b) SO3

(c) SO4

(d) None of the mentioned

I got this question in an interview.

Enquiry is from Mole Fraction and Mass(Weight) Fraction topic in division Moles, Density & Concentration of Basic Chemical Engineering

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The correct option is (b) SO3

The best I can explain: Mole fraction of Sulphur = (40/32)[(40/32) + (60/16)] = 0.25, => Mole fraction of oxygen = 0.75, => Empirical formula of compound is SO3.

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