Recent questions tagged physical-chemistry

Four moles of electrons were transferred from anode to cathode in an experiment of electrolysis of water.The total volume of two gases produced will be approximately(in litre) at STP.

asked Feb 17, 2014 by sreemathi.v

1 answer

The Van't Hoff factor of $Na_2SO_3$ is

asked Feb 17, 2014 by sreemathi.v

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The time for a certain volume of a gas A to diffuse through a small hole is 2 minute. If it takes 5.65 minute for oxygen to diffuse under simililar conditions. Find the molecular weight of A.

asked Feb 16, 2014 by sharmaaparna1

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At same temperature two bulbs A and B of equal capacity are filled with He and $SO_2$ respectively. If the pressure in two bulbs is same. Calculate the ratio of rms speed for them.

asked Feb 16, 2014 by sharmaaparna1

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At 400K the root mean square (rms) speed of a gas x (mol weight = 40) is equal to the most probable speed of gas Y at 60K. Find the molecular weight of gas Y

asked Feb 16, 2014 by sharmaaparna1

1 answer

5.6 litre of an unknown gas at NTP requires 12.5 calorie to raise its temperature by $10^{\large\circ}C$ at constant volume. Calculate the $C_v$ of the gas.

asked Feb 16, 2014 by sharmaaparna1

1 answer

1 litre capacity flask containing $HN_3$ at 1 atm and $25^{\large\circ}C$. A spark is passed through untill all the $HN_3$ is decomposed into $N_2$ and $H_2$. Calculate the pressure of gases left at $25^{\large\circ}$

asked Feb 16, 2014 by sharmaaparna1

1 answer

Calculate the volume occupied by 96g $CH_4$ at 16 atm and $27^{\large\circ}C$.(R = 0.08litre atm $K^{-1}mol^{-1}$.

asked Feb 16, 2014 by sharmaaparna1

1 answer

A container having 3 mole of gas occupies 60 litre at pressure P and temperature T . If 0.2 mole of gas are introduced at same P and T. Find the change in volume.

asked Feb 15, 2014 by sharmaaparna1

1 answer

A certain amount of an ideal gas occupies a volume of $1.0m^3$ at a given temperature and pressure. What would be its volume after reducing its pressure to half the initial value and raising the temperature twice the initial value?

asked Feb 15, 2014 by sharmaaparna1

1 answer

4 litre $C_2H_4(g)$ burns in oxygen at $27^{\large\circ}C$ and 1atm to produce $CO_2(g)$and $H_2O(g)$. Calculate the volume of $CO_2$ formed at $27^{\large\circ}C$ and 4 atm

asked Feb 15, 2014 by sharmaaparna1

1 answer

7g of a gas occupies a volume of 4:1 litre at 300K. If mol weight of gas is 42 , then find the pressure of it.

asked Feb 15, 2014 by sharmaaparna1

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Calculate the weight of $N_2$ in 6.24 litre cylinder at $27^{\large\circ}C$ and 750 mm Hg. (R = 0.0821 litre atm $K^{-1}mol^{-1}$)

asked Feb 15, 2014 by sharmaaparna1

1 answer

A compound exists in the gaseous phase both as monomer (A) and dimer $(A_2)$. The molecular weight of A is 48 . In an experiment 96g of the compound was confined in a vessel of volume 33.6 litre and heated to $273^{\large\circ}C$. Calculate the pressure developed if the compound exists as dimer to the extent of $50\%$ by weight under these conditions.

asked Feb 15, 2014 by sharmaaparna1

1 answer

Calculate the pressure exerted by $10^{23}$ gas molecules each of mass $10^{-22}$ g in a container of volume one litre. The rms speed is $10^5 cm \;sec^{-1}$

asked Feb 15, 2014 by sharmaaparna1

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Under 3atm , 12.5 litre of a certain gas weigh 15g. Calculate the average speed of gaseous molecules.

asked Feb 15, 2014 by sharmaaparna1

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A 4:1 molar mixture of He and $CH_4$ is contained in a vessel at 20 bar pressure. Due to a hole in the vessel, the gas mixture leaks out. What is the composition of the mixture effusing out initially?

asked Feb 15, 2014 by sharmaaparna1

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The relative rates of diffusion of gas B as compared to that of diatomic gas A is 6.5. Find the molecular weight of B if atomic weight of A is 36.

asked Feb 15, 2014 by sharmaaparna1

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$20 dm^3$ of $SO_2$ diffuses through a porous partition in 60 Seconds. What Volume be $O_2$ will diffuse under similiar conditions in 30 second?

asked Feb 14, 2014 by sharmaaparna1

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A gaseous mixture of $O_2 and N_2$ are in the ratio of 1:4 by weight . Calculate their ratio of molecules.

asked Feb 14, 2014 by sharmaaparna1

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Calculate the total pressure in a mixture of 4g $O_2\;and \;2g\;H_2$ confined in a bulb of 1 litre at $0^{\large\circ}C$

asked Feb 14, 2014 by sharmaaparna1

1 answer

Two gases A and B having molecular weights 60 and 45 respectively are enclosed in a vessel . The weight of A is 0.50g and that of B is 0.2g. The total pressure of the mixture is 750mm. Calculate partial pressure of the two gases.

asked Feb 14, 2014 by sharmaaparna1

1 answer

$20\% N_2O_4$ molecules are dissociated in a sample of gas $27^{\large\circ}$ and 760 torr. Calculate the density of the equilibrium mixture.

asked Feb 14, 2014 by sharmaaparna1

1 answer

If $10^{-4} dm^3$ of water is introduced into a $1.0dm^3$ flask to 300K. How many moles of water are in the vapour phase when equilibrium is established? (Given Vapour pressure of $H_2O$ at 300K is 3170 Pa ; $R = 8.314JK^{-1}mol^{-1}$

asked Feb 14, 2014 by sharmaaparna1

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The ratio of the rate of diffusion of helium and methane under identical conditions of pressure and temperature is

asked Feb 14, 2014 by sharmaaparna1

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The root mean square speed of one mole of a monoatomic gas having molecular mass M is $U_{rms}$. The relation between the average kinetic energy (E) of the gas and $U_{rms}$ is:

asked Feb 14, 2014 by sharmaaparna1

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Positive deviations from ideal gas behaviour takes place because

asked Feb 14, 2014 by sharmaaparna1

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When the temperature is increased surface tension of water

asked Feb 14, 2014 by sharmaaparna1

1 answer

Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 4.0mole of benzene and 6 mole of toluene in solution.

asked Feb 14, 2014 by sreemathi.v

1 answer

Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is

asked Feb 14, 2014 by sreemathi.v

1 answer