Q.

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]

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answer is 2.

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Detailed Solution

Assuming dilute solutionΔPPA0=nBnA=wBmB⋅mAwA20100=8mB⋅114114mB=8×10020=40gmol−1

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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]