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  • Using Raoult’s law explain how the total vapour pressure over the solution is related to mole traction of components in the given solutions.

Using Raoult’s law explain how the total vapour pressure over the solution is related to mole fraction of components in the following solutions.
(a) CHCl_3(l) \; \text{and} \;CH_2Cl_2(l)
(b) NaCl(s)\; \text{and}\;H_{2}O(l)

Answers (1)

p=p_A^ox_A+p_B^ox_B

Where, p_A^o,p_B^o are the vapour pressure of pure components (A) and (B)

And x_{A}\text{and }x_{B} are the mole fractions of the components in the solution.

 

(b) On dissolving in water, the vapour pressure lowers. Vapour pressure of solution is:

p=p^ox_A

Where x_{A}=mole fraction of solvent

p^{0}=vapour pressure of pure solvent

p=vapour pressure of solution

Similarly,

\frac{\Delta p}{p^o}=x_B

\Delta p=p^o-p

x_{B}=mole fraction of solute

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