If 8 g of a non-electrolyte solute is dissolved in 114 g 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 114 g mol - 1 ]

Question

If 8 g of a non-electrolyte solute is dissolved in 114 g 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 114 g mol - 1 ], 40, 60, 80, 20

MARKS App · Accepted Answer

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.

Search any question & find its solution

Looking for more such questions to practice?