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The vapour pressure of pure benzene at a...

The vapour pressure of pure benzene at a certain temperature is 640 mm of Hg. A non-volatile non-electrolyte solid weighing 2.175 g is added to 39 g of benzene. The vapour pressure of the solution is 600 mm of Hg. What is molecular weight of solid substance?

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The vapour pressure of pure benzene at a certain temperature is 640 mm Hg . A non-volatile solid weighing 2.175g is added to 39.0g of benzene. The vapour pressure of the solution is 600mm Hg . What is the molar mass of the solid substance?

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non - volatile, non - electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol^(-1) ). Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance ?

Knowledge Check

  • The vapour pressure of acetone at 20^(@)C is 185 torr. When 1.2 g of a non - volatile substance was dissolved in 100 g of acetone at 20^(@)C , its vapour pressure was 183 torr. The molar mass (g mol^(-1)) of the substance is :

    A
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    B
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    C
    128
    D
    488

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