States of Matte...

On a humid day in summer, the mole fraction of gaseous $$H_{2}O$$ (water vapour) in the air at $$25^0$$C can be as high as $$0.0287$$. Assuming a total pressure of $$0.977$$ atm. What is the partial pressure of dry air?

The ratio of the vapour pressure of a solution to the vapour pressure of the solvent is:

At a given temperature, total vapour pressure in Torr of a mixture volatile components A and B is given by 
$$P_{Total}=120-75X_B$$
Hence, vapour pressure of pure A and B respectively (in Torr) are ?

Pressure exerted by one mole of an ideal gas kept in vessel of '$$V$$' L having root mean square molecule '$$V$$' and '$$m$$' mass of each molecule is correctly given by the equation?

Water and chlorobenzene are immiscible liquids. Their mixture boils at $$89^o$$C under a reduced pressure of $$7.7 \times 10^4$$ Pa. The vapour pressure of pure water at $$89^o$$C is $$7 \times 10^4$$ Pa. Weight percent of chlorobenzene in the distillate is:

Two glass bulbs A and B are connected by a very small tube having a stop cock. Bulb A has a volume of 100 $$cm^{3}$$ and contained the gas, while bulb B was empty. On opening the stop cock, the pressure fell down 40%. The volume of the bulb B must be ?

At $$80^0$$C, the vapour pressure of pure liquid A is $$250$$mm of Hg and that of pure liquid B is $$1000$$ mm of Hg. If a solution of A and B boils at $$80^0$$C and $$1$$ atm pressure, the amount of A in the mixture is :$$(1atm = 760mm$$Hg)

Which of the following statement is wrong ? 

At $$80^o$$C, the vapour pressure of pure liquid $$A$$ is $$250$$ mm of $$Hg$$ and that of pure liquid $$B$$ is $$1000$$ mm of $$Hg$$. If a solution of $$A$$ and $$B$$ boils at $$80^o$$ and $$1$$ atm pressure, the amount of $$A$$ in the mixture is? 

At 80C, the vapour pressure of pure benzene is 753 mm Hg and of pure toluene 290 mm Hg. Calculate the composition of a liquid in mole percent which at $$80$$ is in equilibrium with vapour containing 30 mole percent of benzene.