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If two compounds have same empirical formula but different molecular formulae, they must have,

(a)Different percentage composition

(b)Different Molecular weights

(c) same viscosity

(d) Same vapour density

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Since the molecular formula is n-times the empirical formula, therefore , different compounds having the same empirical formula must have different molecular weights.
Hence b is the correct answer.
answered Feb 26, 2014 by meena.p
edited Mar 21, 2014 by balaji.thirumalai

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