Chemistry Class 12 NCERT Solutions: Chapter 2 Solutions Part 15

Q: 35. Henry's law constant for the molality of methane in benzene at Equation mm Hg. Calculate the solubility of methane in benzene at Equation Kunder Equation .

Answer:

Here,

Equation

Equation

According to Henry’s law,

Equation

Equation

Equation

Equation

Equation

Hence, the mole fraction of methane in benzene is Equation .

Q: 36. 100 g of liquid A Equation was dissolved in Equation of liquid B (molar mass 180 g mol-1). The vapour pressure of pure liquid B was found to be 500 Torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 Torr.

Answer:

Number of moles of liquid A, Equation

Equation

Number of moles of liquid B, Equation

Equation

Then, mole fraction of A, Equation

Equation

Equation

And, mole fraction of B, Equation

Equation

Vapour pressure of pure liquid B, Equation torr

Therefore, vapour pressure of liquid B in the solution,

Equation

Equation

Equation

Total vapour pressure of the solution, Equation

Equation Vapour pressure of liquid A on the solution,

Equation

Equation

Equation

Now,

Equation

Equation

Equation

Equation

Hence, the vapour pressure of pure liquid A is 280.7 torr

Q: 37. 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 Equation ' Equation ' and Equation a function of Equation . The experimental data observed for different compositions of mixture is.

Q_37_1_Table of Experimental Data observed for Different Compositions of Mixture
Q_37_1_Table of Experimental Data observed for Different Compositions of Mixture

Equation

0

11.8

23.4

36.0

50.8

58.2

64.5

72.1

Equation

0

54.9

110.1

202.4

322.7

405.9

454.1

521.1

Equation

632.8

548.1

469.4

359.7

257.7

193.6

161.2

120.7

Answer:

From the question, we have the following data

Q_37_2_Table of Experimental Data observed for Different Compositions of Mixture
Q_37_2_Table of Experimental Data observed for Different Compositions of Mixture

Equation

0

11.8

23.4

36.0

50.8

58.2

64.5

72.1

Equation

0

54.9

110.1

202.4

322.7

405.9

454.1

521.1

Equation

632.8

548.1

469.4

359.7

257.7

193.6

161.2

120.7

Equation

632.8

603.0

579.5

562.1

580.4

599.5

615.3

641.8

Q 37 2 Image of Vapour pressure Hg

Q 37 2 Image of Vapour Pressure Hg

Q 37 2 Image of Vapour pressure Hg

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

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