States of Matte...

A vessel contains equal masses of three gases $$A,\ B,\ C$$ and recorder a pressure of 3.5 bar at $${ 25 }^{ o }$$ C. The molecular mass of $$C$$ is twice that of $$B$$ and molecular mass of $$A$$ is half of B. Find the partial pressure of $$B$$ (in bar the vessel).

Two liquids A and B form an ideal solution. The vapour pressure of pure A and pure B are 66mm of Hg and 88mm of Hg, respectively. Calculate the composition of vapour A in the solution which is equilibrium and whose molar volume is 36%.

The vapour pressure of pure liquid is $$70$$ Torr at $$27^o C$$. The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is $$84$$ Torr at $$27^o C$$. The vapour pressure of pure liquid $$B$$ at $$27^o C$$ is?

A solution has a $$1:4$$ mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at $$20^{\circ}C$$ are $$440$$ mm of $$Hg$$ for pentane and $$120$$ mm of $$Hg$$ for hexane. The mole fraction of pentane in the vapour phase would be?

$${ \Delta  }_{ f }{ G }^{ o }$$ at $$500\ K$$ for substance $$S$$ in liquid state and gaseous state are $$ +100.7\ kcal\ { mol }^{ -1 }$$ and $$ +103\ kcal\ { mol }^{ -1 }$$ respectively. Vapour pressure of liquid $$S$$ at $$500\ K$$ is approximately equal to: $$(R= 2\ { cal }\ K^{ -1 }\ { mol }^{ -1 })$$

The vapour pressure of a solvent decreased by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mm of mercury?

$$20$$ litre of an ideal gas, present in a piston fitted cylinder at $$10$$ atm is allowed to expand in a process in which $$P/V$$ is a constant. If final volume of gas is $$60$$  litre, then work done by gas is:

A bulb of unknown volume contained an ideal gas at 650mm pressure. A certain amount of the gas was withdrawn and found to occupy 1.5 cc at 700 mm pressure. The pressure of the gas remaining in the bulb was found to be 600 mm. If all measurements are made at the same temperature, the volume of the bulb is ?

An open bulb containing air at $$19^{\circ}C$$ was cooled to a certain temperature at which the number of moles of the gaseous molecules increased by $$25\%$$. The final temperature is: