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Question

Vapour pressure of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotalpchloroform’ and pacetone as a function of xacetone. The experimental data observed for different compositions of mixture is.

100 ×xacetone

0

11.8

23.4

36.0

50.8

58.2

64.5

72.1

pacetone /mm Hg

0

54.9

110.1

202.4

322.7

405.9

454.1

521.1

pchloroform/mm Hg

632.8

548.1

469.4

359.7

257.7

193.6

161.2

120.7

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Solution

From the question, we have the following data

100 ×xacetone

0

11.8

23.4

36.0

50.8

58.2

64.5

72.1

pacetone /mm Hg

0

54.9

110.1

202.4

322.7

405.9

454.1

521.1

pchloroform/mm Hg

632.8

548.1

469.4

359.7

257.7

193.6

161.2

120.7

ptota(mm Hg)

632.8

603.0

579.5

562.1

580.4

599.5

615.3

641.8

It can be observed from the graph that the plot for the ptotal of the solution curves downwards. Therefore, the solution shows negative deviation from the ideal behaviour.


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