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   mo

Question

If 8 &#160; g of a non-electrolyte solute is dissolved in 114 &#160; g of n - octane to reduce its vapour pressure to 80 % , the molar mass (in g &#160; mol - 1 ) of the solute is [Given that molar mass of n-octane is 114 &#160; g &#160; mol - 1 ]

Quantrex Academy · Accepted Answer

Correct answer: A. 40

Assuming dilute solution, P 0 - P s P s &#8776; P 0 - P s P 0 = n solute&#160; n solvent&#160; Let P 0 = 100 , V.P reduced to 80 % , &#8756; P s = 80 100 - 80 100 = 8 / m 114 / 114 m = 40 g/mol.

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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If 8 &#160; g of a non-electrolyte solute is dissolved in 114 &#160; g of n - octane to reduce its vapour pressure to 80 % , the molar mass (in g &#160; mol - 1 ) of the solute is [Given that molar mass of n-octane is 114 &#160; g &#160; mol - 1 ]

Options

Correct answer

Step-by-step solution

More from Solutions

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 ]