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A solution containing 8 g of a substance in 100 g of diethyl ether boils at 36.86°C, whereas pure ether boils at 35.60 °C. Determine the molecular mass of the solute (For ether Kb 2.02 K kg mol-1)

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We have, 

mass of solute, W2 = 8 g 

Mass of solvent, W1 = 100 g 

Elevation of boiling point 

∆Tb = 36.86 – 35.60 = 1.26°C

Kb = 2.02 

Molecular mass of the solute

= 128.25 g mol-1

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