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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 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 moler mass of the solid substance ?

Two liquids A and B form an ideal solution. At 300 k, the vapour pressure of a solution containing 1 mole of A and 3 moles of B is 550 mm of Hg. At the same temperature, if one mole of B is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. Determine the vapour pressure of A and B in their pure states.

Knowledge Check

  • The vapour pressure of a solvent is found to be 400 mm Hg at 300 K. When a certain amount of a nonvolatile solute is added to 50 mol of the solvent its vapour pressure decreases to 360 mm Hg. The amount of solute added is

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    B
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    D
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  • Two liquids A and B from ideal solutions. At 300 K, the vapour pressure of solution containing 1 mote of A and 3 mole of B is 550 mm Hg. At the same temperature, if one more movie of B is added to this solution, the vapour pressure of the solution increasés by 10 mm Hg. Determine the vapour pressure of A and B in their pure states (in mm Hg) :

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

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    C
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    D
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