If 8g of a non-electrolyte solute is dissolved in 114g of n - octane to reduce its vapour pressure to 80 % , the molar mass (in g mol ^ - 1 ) of the solute is [Given that molar mass of n-octane is 114g mol ^ - 1 ]

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Correct answer: A. 40

Assuming dilute solution, P _ 0 - P _ s P _ s P _ 0 - P _ s P _ 0 = n _ solute n _ solvent Let P _ 0 = 100, V.P reduced to 80 % , ∴ P _ s = 80 (100 - 80)/(100) = (8 / m)/(114 / 114) m = 40 g/mol.

If 8g of a non-electrolyte solute is dissolved in 114g of n -...

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