States of Matte...

Air contains $$79\% \ N_2$$ and $$21\% O_2$$ by volume. If the pressure is $$750 \ mm$$ of $$Hg$$, the partial pressure of oxygen $$(O_2)$$ is:

A balloon weighting $$50 Kg$$ is filled with $$ 685 kg$$ of helium at $$1 atm$$ pressure and $${ 25 }^{ o }C$$. What will be its pay load if it displaced $$5108 kg$$ of air?

The measured density at $$NTP$$ of a gaseous sample of a compound was found to be $$1.78\ g/L$$. What is the weight of $$1\ mole$$ of the gaseous sample?

$$2.8 g$$ of a gas at $$1atm$$ and $$273K$$ occupies a volume of $$2.24$$ litres. The gas can not be:

A $$3.00\ L$$ oxygen gas is collected over water at $${27}^{o}C$$ when the barometric pressure is $$787\ Torr$$. If vapour pressure of water is $$27\ Torr$$ at $${27}^{o}C$$, moles of $$O_{2}$$ gas will be?

A liquid A and B form an ideal solution. If vapour pressure of pure A and B are $$500N{ m }^{ -2 }$$ and $$200N{ m }^{ -2 }$$ respectively, the vapour pressure of a solution of A and B containing 0.2 mole fraction of A would be:

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of $$290\ mm$$ at $$300\ K$$. The vapour pressure of propyl alcohol is $$200\ mm$$. If the mole fraction of ethyl alcohol is $$0.6$$, its vapour pressure (in $$mm$$) at the same temperature will be:

Equal weight of methane and hydrogen are mixed in an empty container at $${ 25 }^{ 0 }C$$. The fraction of total pressure exerted by hydrogen is?

A baloon blown up with $$1 $$ mole of gas has a volume of $$480 mL$$ at $$5^oC.$$ the balloon is field to $$(7/8)th$$ of its maximum capacity suggest. The minimum temperature at which it will brust?

The surface of a lake is at $$2^{o}C$$ and depth of the lake is $$20\ m$$. Find the temperature of the bottom of the lake?