NCERT Class XII Chemistry
Chapter - Solutions
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Question : 37
Total: 53
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 Ptotal, Pchloroform and Pacetone as a function of xacetone. The experimental data observed for different compositions of mixtures is :
 100×xacetone  0  11.8  23.4  36.0  50.8  58.2  64.5  72.1
 PacetonemmHg  0  54.9  110.1  202.4  322.7  405.9  454.1  521.1
 PchloroformmmHg  632.8  548.1  469.4  359.7  257.7  193.6  161.2/td>  120.7
Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
Solution:  
 xacetone  0.0  0.118  0.234  0.360  0.508  0.582  0.645  0.721
 PacetonemmHg  0  54.9  110.1  202.4  322.7  405.9  454.1  521.1
 PchloroformmmHg  632.8  548.1  469.4  359.7  257.7  193.6  161.2  120.7
Ptotal 632.8 603.0 579.5 562.1 580.4 599.5 615.3 641.8
As the plot for Ptotal dips downwards, hence the solution shows negative deviation from the ideal behaviour.
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