$A$ solution of liquids $A$ and $B$ is given. The mole fraction of $A$ in the vapor phase is $x_1$ and in the liquid phase is $x_2$. If $P_A^o$ and $P_B^o$ are the vapor pressures of pure $A$ and $B$ respectively,then the total vapor pressure $P_{total}$ will be:

  • A
    $\frac{x_1}{x_2} P_A^o$
  • B
    $\frac{x_2}{x_1} P_A^o$
  • C
    $\frac{x_1}{x_2} P_B^o$
  • D
    $\frac{x_2}{x_1} P_B^o$

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Explain how the solubility of a gaseous solute and the vapour pressure of a liquid solution follow Henry's and Raoult's laws.

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$A$ solution is prepared by dissolving $10 \ g$ of a non-volatile solute (molar mass,'$M$ $g \ mol^{-1}$') in $360 \ g$ of water. What is the molar mass in $g \ mol^{-1}$ of solute if the relative lowering of vapour pressure of solution is $5 \times 10^{-3}$?

According to Raoult's law,the relative lowering of vapour pressure of a solution of a non-volatile solute is equal to:

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