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  • The total pressure observed by mixing two liquids A and B is 350 mmHg when their mole fractions are 0.7 and 0.3 respectively. The total pressure become 410 mmHg if the mole fractions are changed to

The total pressure observed by mixing two liquids A and B is 350 mmHg when their mole fractions are 0.7 and 0.3 respectively. The total pressure become 410 mmHg if the mole fractions are changed to 0.2 and 0.8 respectively for A and B. The vapour pressure of pure A is________ mm Hg. (Nearest integer) Consider the liquids and solutions behave ideally.

Option: 1

314


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

\begin{aligned} & \mathrm{XaP}_{\mathrm{A}}^{\mathrm{o}}+\mathrm{X}_{\mathrm{B}} \mathrm{P}_{\mathrm{B}}^{\mathrm{o}}=\mathrm{P}_{\mathrm{S}} \\ & 0.7 \mathrm{P}_{\mathrm{A}}^{\mathrm{o}}+0.3 \mathrm{P}_{\mathrm{B}}^{\mathrm{o}}=350 \\ & 0.2 \mathrm{P}_{\mathrm{A}}^{\mathrm{o}}+0.8 \mathrm{P}_{\mathrm{B}}^{\mathrm{o}}=410 \\ & \therefore \mathrm{P}_{\mathrm{A}}^{\mathrm{o}}=314 \text { torr } \end{aligned}

Posted by

Ramraj Saini

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