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The vapour pressure of pure benzene at a...

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

Text Solution

AI Generated Solution

To find the molar mass of the solid substance, we can use the formula derived from Raoult's Law for the lowering of vapor pressure: \[ \frac{P^0 - P_s}{P^0} = \frac{W_2 \cdot M_1}{W_1 \cdot M_2} \] where: - \( P^0 \) is the vapor pressure of pure benzene. - \( P_s \) is the vapor pressure of the solution. - \( W_2 \) is the mass of the solute. ...
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The vapour pressure of pure benzene at a certain temperature is 0.500 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass "78 g mol"^(-1) ). The vapour pressure of the solution then is 0.845 bar. What is the molar mass of the solid substance ?

The vapor pressure of pure benzene at a certain temperature is 640 mmHg . A nonvolatile nonelectrolyte solid weighing 2.0 g is added to 39 g of benzene. The vapor pressure of the solution is 600 mmHg . What is the molecular mass of the solid substance. Strategy: Use Equation (2.58) as the concept of colligative properties is based on dilute solution. The moleculsr mass of benzene is 78u .

Knowledge Check

  • The vapour pressure of benzene at a certain temperature is 640 mm of Hg A non-volatile and non-electrolyte solid weighing 2.175g is added to 39.08g of benzene .the vapour pressure of the solution is 600 mm of Hg. What is the molecular weight of solid substance ?

    A
    `49.50`
    B
    `59.6`
    C
    `69.5`
    D
    `79.8`

  • The vapour pressure of benzene at a certain temperature is 640 mm Hg . A non-volatile and non-electrolyte soild weighing 2.175 g is added to 39.08 g of benzene. If the vapour pressure of the solution is 6 mmHg . What is the molecular mass of solid substance?

    A
    `79.82 u`
    B
    `69.40 u`
    C
    `59.60 u`
    D
    `49.50 u`

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