Chemistry Class 12 NCERT Solutions: Chapter 2 Solutions Part 3

Q: 7. Henry's law constant for Equation in water is Equation Pa at Equation . Calculate the quantity of Equation in Equation mL of soda water when packed under Equation atm Equation pressure at Equation .

Answer:

It is given that:

Equation

Equation

Equation

According to Henry's law:

Equation

Equation

Equation

Equation

We can write, Equation

Equation is negligible as compared to Equation ]

In Equation of soda water, the volume of water Equation

[Neglecting the amount of soda present]

We can write:

Equation of water Equation of water

Equation

Equation

Now, Equation x

Equation

Equation

Hence, quantity of Equation in 500 mL of soda water Equation

Equation

Q: 8. The vapour pressure of pure liquids A and B are Equation and Equation mm Hg respectively, at Equation K. Find out the composition of the liquid mixture if total vapour pressure is Equation mm Hg. Also, find the composition of the vapour phase.

Answer:

It is given that:

Equation

Equation

Equation

From Raoult’s law, we have:

Equation

Equation Therefore, total pressure, Equation

Equation

Equation

Equation

Equation

Equation

Equation

Therefore, Equation

Equation

Equation

Now, Equation

Equation

Equation

Now, Equation

Equation

Equation

Now, in the vapour phase

Mole fraction of liquid A Equation

Equation

Equation

Equation

Ans, mole fraction of liquid Equation

Equation

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