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Concentration Terms - An Introduction (w/w etc)

The vapour pr...

Question

The vapour pressure of the solution of two liquids $A (P^{o} = 80 mm)$ and $B (P^{o} = 120 mm)$ is found to be $100 mm$ when $X_{A} = 0.4$ . The result shows that:

Solution exhibits ideal behaviour

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Solution shows positive deviations

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Solution shows negative deviations

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Solution will show positive deviations for lower concentration and negative deviations for higher concentrations.

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Solution

The correct option is C Solution shows negative deviations
$\begin{matrix} P_{A}^{\circ} = 80 mm & P_{B}^{\circ} = 120 mm X_{A} = 0.4 & X_{B} = 0.6 \end{matrix}$
$P_{t o t a l} = 0.4 \times 80 + 0.6 \times 120 = 104 mm$
$Observed vapour pressure < calculated vapour pressure$ .
Therefore, solution shows negative deviation.

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The vapour pressure of the solution of two liquids A(Po=80 mm) and B(Po=120 mm) is found to be 100 mm when XA=0.4. The result shows that:

The correct option is C Solution shows negative deviationsP∘A=80 mmP∘B=120 mmXA=0.4XB=0.6 Ptotal=0.4×80+0.6×120=104 mm Observed vapour pressure < calculated vapour pressure. Therefore, solution shows negative deviation.

The vapour pressure of the solution of two liquids $A (P^{o} = 80 mm)$ and $B (P^{o} = 120 mm)$ is found to be $100 mm$ when $X_{A} = 0.4$ . The result shows that: