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2.56g of Sulphur is dissolved in 100g of carbon disuiphide. The solution boils at 319.692K. What is the molecular formula of Sulphur in solution? The boiling point of CS2 is 319. 450K. Given that Kb for CS2 = 2.42 K kg mol-1

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W2 = 2.56g 

W1 = 100g 

T = 319.692 K 

Kb = 2.42 K kg mol-1 

∆Tb = (319.692 – 319.450) K = 0.242 K

M = 256 g mol-1

Molecular mass of sulphur in solulion = 256 g mol-1 

Atomic mass of one mole of sulphur atom = 32 

No. of atoms in a molecule of sulphur = \(\frac{256}{32}\) = 8 

Hence, molecular tòrmula of sulphur is S8 .

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