(C) According to Raoult's law for an ideal solution,the total vapour pressure $P_s$ is given by: $P_s = P_A^0 x_A + P_B^0 x_B$ Given: $P_A^0$ (benzene

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(C) According to Raoult's law for an ideal solution,the total vapour pressure $P_s$ is given by: $P_s = P_A^0 x_A + P_B^0 x_B$ Given: $P_A^0$ (benzene) $= 280 \ mm \ Hg$ $P_B^0$ (octane) $= 420 \ mm \ Hg$ Molar ratio $= 3 : 2$,so mole fractions are: $x_A = \frac{3}{3+2} = \frac{3}{5} = 0.6$ $x_B = \frac{2}{3+2} = \frac{2}{5} = 0.4$ Substituting the values: $P_s = (280 \times 0.6) + (420 \times 0.4)$ $P_s = 168 + 168$ $P_s = 336 \ mm \ Hg$

Class 12 Chemistry Solutions Lowering of vapour pressure

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The correct option for the value of vapour pressure of a solution at $45^{\circ} C$ with benzene to octane in molar ratio $3 : 2$ is ...... $mm$ of $Hg$. [At $45^{\circ} C$,vapour pressure of benzene is $280 \ mm \ Hg$ and that of octane is $420 \ mm \ Hg$. Assume ideal solution.]

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A
$160$
B
$168$
C
$336$
D
$350$

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Lowering of vapour pressure

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If two substances $A$ and $B$ have $P_A^0 : P_B^0 = 1 : 2$ and have mole fraction in solution $1 : 2$,then what is the mole fraction of $A$ in the vapour phase?

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

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Which solution has the highest vapour pressure?

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The vapor pressures of two liquids $P$ and $Q$ are $80 \ torr$ and $60 \ torr$,respectively. The total vapor pressure of a solution formed by mixing $3 \ moles$ of $P$ and $2 \ moles$ of $Q$ is .......... $torr$.

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What is the vapor pressure of a solution containing a solid solute and a liquid solvent?

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The correct option for the value of vapour pressure of a solution at $45^{\circ} C$ with benzene to octane in molar ratio $3 : 2$ is ...... $mm$ of $Hg$. [At $45^{\circ} C$,vapour pressure of benzene is $280 \ mm \ Hg$ and that of octane is $420 \ mm \ Hg$. Assume ideal solution.]

Similar Questions

If two substances $A$ and $B$ have $P_A^0 : P_B^0 = 1 : 2$ and have mole fraction in solution $1 : 2$,then what is the mole fraction of $A$ in the vapour phase?

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

Which solution has the highest vapour pressure?

The vapor pressures of two liquids $P$ and $Q$ are $80 \ torr$ and $60 \ torr$,respectively. The total vapor pressure of a solution formed by mixing $3 \ moles$ of $P$ and $2 \ moles$ of $Q$ is .......... $torr$.

What is the vapor pressure of a solution containing a solid solute and a liquid solvent?

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