Recent questions and answers in States of Matter: Liquids and Gases

STATEMNENT-1 : In a solution of water and ethyl alcohol, if mole fraction of ethyl alcohol is $0.9,$ then water acts as solute in the solution. STATEMNENT-2 : If both the components of solution are in same physical state as that of solution, the component present in major amount is known as solvent and the other component is known as solute.

answered Jan 18, 2016 by meena.p

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what would be the ratio of mean square velocity of hydrogen gas at 50K and that of oxygen gas at 800K?

answered Sep 18, 2014 by balaji.thirumalai

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What is the pressure of HCl gas at $-40^{\large\circ}C$ if its density is $8.0 kgm^{-3}? (R = 8.314 JK^{-1}mol^{-1})$

answered Apr 8, 2014 by sharmaaparna1

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A sample of gas occupies a volume of 512 mL at $20^{\large\circ}C$ and 74 cm of Hg as pressure . What volume would this gas occupy at STP?

answered Apr 8, 2014 by sharmaaparna1

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Helium and Argon are monoatomic gases and their atomic weights are 4 and 40 respectively . Under identical conditions, helium will diffuse through a semipermeable membrane

answered Apr 8, 2014 by sharmaaparna1

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2g of hydrogen diffuses from a container in 10 minutes . How many grams of oxygen would diffuse through the same container in the same time under similiar conditions ?

answered Apr 8, 2014 by sharmaaparna1

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The time taken for a certain volume of a gas X to diffuse through a small hole is 2 minutes . It takes 5.65 minutes for oxygen to diffuse under the similiar conditions . The molecular weight of X is

answered Apr 8, 2014 by sharmaaparna1

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If same moles of $O_2$ diffuse in 18 sec and same mole of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas?

answered Apr 8, 2014 by sharmaaparna1

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The root mean square of a gas at 300K is $3\sqrt{R}$. The molar mass of this gas in $Kg mol^{-1}$ is

answered Apr 7, 2014 by sharmaaparna1

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The $U_{rms}$ of $SO_2 \;at\;27^{\large\circ}C$

answered Apr 7, 2014 by sharmaaparna1

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The average kinetic energy of 1.6 g $CH_4$ molecules at $27^{\large\circ}C$ is:

answered Apr 7, 2014 by sharmaaparna1

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The intermolecular forces vanishes among water molecules , then volume occupied by 1.8 g $H_2O(l)$ at STP is

answered Apr 7, 2014 by sharmaaparna1

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The intercept of plots of log V vs log T curves at constant pressure P for 1 mole gas will be

answered Apr 7, 2014 by sharmaaparna1

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For one mole of an ideal gas $(\large\frac{\delta P}{\delta T})_V.(\large\frac{\delta V}{\delta T})_P . (\large\frac{\delta V}{\delta T})_T $ is equal to ....

answered Apr 7, 2014 by sharmaaparna1

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The kinetic molecular theory attributes an average translational kinetic energy of $\large\frac{3}{2}\large\frac{RT}{N}$ to each particle. What rms speed woul a mist particle of mass $10^{-12}g$ have a root temperature $(27^{\large\circ}C)$ according to kinetic theory of gases.

answered Apr 7, 2014 by sharmaaparna1

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The composition of the equilibrium mixture $(Cl_2\iff2Cl)$ which is attained at $1200^{\large\circ}C$ is determined by measuring the rate of effusion through a pinhole . It is observed that at 1.80 mm Hg pressure , the mixture effuses 1.16 times as fast as krypton effuses under the same conditions. Calculate the fraction of chlorine molecules dissociated anto atoms.(Atomic wt of Kr = 84)

answered Apr 5, 2014 by sharmaaparna1

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Pure $O_2$ diffuses through an aperture in 224 seconds whereas mixture of $O_2$ and another gas containing $80\%\;O_2$ diffuses from the same in 234 sec. What is mol. wt. of gas?

answered Apr 5, 2014 by sharmaaparna1

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The average speed at $T_1K$ and the most probable speed at $T_2K of $CO_2$ gas is $9\times10^4cm/s. Calculate the value of $T_1 and T_2$

answered Apr 5, 2014 by sharmaaparna1

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The density of a mixture of $O_2$ and $N_2$ at NTP is 1.3g/l . Calculate partial pressure of $O_2$ .

answered Apr 5, 2014 by sharmaaparna1

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The pressure exerted by 12g of an ideal gas at temperature $t^{\large\circ}C$ in a vessel of volume V litre is one atm. when the temperature is increased by 10 degree at the same volume , the pressure increases by $10\%$. Calculate the temperature t and volume V (molecular weight of the gas = 120 )

answered Apr 4, 2014 by sharmaaparna1

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A gas filled freely collapsible balloon is pushed from the surface level of lake to a depth of 100 metre . Calculate what per cent of its original volume , the balloon finally have ? Assume ideal gas nature .

answered Apr 3, 2014 by sharmaaparna1

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Equal weights of $CH_4$ and $O_2$ are mixed in an empty container of one litre at $27^{\large\circ}C$. Calculate the fraction of total pressure exerted by $O_2$.

answered Apr 3, 2014 by sharmaaparna1

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An open flask contains air at $27^{\large\circ}C$. Calculate temperature at which it should be heated so that , $\large\frac{1}{3}rd$ of air measured at $27^{\large\circ}C$ escapes out.

answered Apr 3, 2014 by sharmaaparna1

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A flask is of a capacity of one litre . What volume of air will escape from the flask if it is heated from $27^{\large\circ}C$ to $37^{\large\circ}C$? Assume pressure as constant.

answered Apr 3, 2014 by sharmaaparna1

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0.553 g of a boron - hydrogen compound created a pressure of 0.658 atm in a bulb of 407 mL at $100^{\large\circ}C$. Analysis showed it to $85.7\%$ boron . Calculate its molecular formula.

answered Apr 3, 2014 by sharmaaparna1

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What would be the final pressure of $O_2$ in following experiment ? A collapsed polyethylene bag of 30 litre capacity is partially blown up by the addition of 10 litre of $N_2$ at 0.965 atm at 298K . Subsequently enough $O_2$ is pumped into bag so that at 298K and external pressure of 0.990 atm, the bag contains full 30 litre.

answered Apr 3, 2014 by sharmaaparna1

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The mean kinetic energy of a molecule at $0^{\large\circ}C$ is $5.62\times10^{-14} erg$ . Calculate Boltzmann's Constant . If the value of $R = 8.314\times10^7 erg$ . and also calculate the no. of molecules present in one mole of gas.

answered Apr 2, 2014 by sharmaaparna1

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Two flasks A and B have equal volumes. Flask A contains $H_2$ at $27^{\large\circ}C$ while B contains equal mass of $C_2H_6$ at $627^{\large\circ}C$. In which flask and by how many times are molecules moving faster ? Assume ideal gas nature for both .

answered Apr 2, 2014 by sharmaaparna1

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The critical constant for water are $374^{\large\circ}C$ 218 atm and 0.0566 litre $mol^{-1}$. Calculate a , b and R.

answered Apr 2, 2014 by sharmaaparna1

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Calculate the temperature of gas if it obeys Van der Waals equation from the following data. A flask of 25 litre contains 10 mole of a gas under 50 atm . Given $a = 5.46\; atm \;litre^2mol^{-2}$ and $b = 0.031\;litre\;mol^{-1}$

answered Apr 2, 2014 by sharmaaparna1

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Using Van der Waals's equation . Calculate the constant 'a' when two mole of a gas confined in a four litre flask exerts a pressure of 11.0 atmospheres at a temperature of 300K . The value of b is 0.05 lit $mol^{-1}$

answered Apr 2, 2014 by sharmaaparna1

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A jar contains a gas and a few drops of water at 'T' K . The pressure in the jar is 830mm of Hg. The temperature of the jar is reduced by $1\%$. The vapour pressure of water at two temperature are 30 and 25 mm of Hg. Calculate the new pressure in the jar.

answered Apr 1, 2014 by sharmaaparna1

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A balloon of diameter 20 metre weighs 100kg . Calculate its pay-load if it is filled with He at 1.0atm and $27^{\large\circ}C$ . Density of air is 1.2 $kgm^{-3}$ . [$R = 0.082dm^3\;atm\; K^{-1}\;mol^{-1}$]

answered Apr 1, 2014 by sharmaaparna1

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A spherical balloon of 21cm diameter is to be filled up with $H_2$ at NTP from a cylinder containing the gas at 20 atm at $27^{\large\circ}C$. The cylinder can hold 2.82 litre of water at NTP . Calculate the number of balloons that can be filled up.

answered Mar 31, 2014 by sharmaaparna1

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A gas occupies 300mL at $27^{\large\circ}C$ and 730 mm pressure . What would be its volume at STP?

answered Mar 31, 2014 by sharmaaparna1

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A vessel has nitrogen gas and water vapour at a total pressure of 1 atm . The partial pressure of water vapour is 0.3 atm. When the contents of this vessel are transformed to another vessel having one third of the capacity of original vessel , completely at the same temperature , the total pressure of the system in the new vessel is:

answered Mar 31, 2014 by sharmaaparna1

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The pressure occupied by one mole of $CO_2$ at 273K is ........ (Given a for $CO_2$ = 3.592 $dm^6atmmol^{-2}$). Assume volume occupied by $CO_2$ molecules is negligible.

answered Mar 31, 2014 by sharmaaparna1

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A gas occupies 0.418 litre at 740 mm of Hg and $27^{\large\circ}C$. Calculate its Volume at STP.

answered Mar 29, 2014 by sharmaaparna1

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The pressure of the atmosphere is $2\times10^{-6}$ at about 100 mile above the earth and temperature is $-180^{\large\circ}C$ .How many mole are there in 1 mL gas at this altitude?

answered Mar 29, 2014 by sharmaaparna1

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A 20g chunk of dry ice is placed in an empty 0.75 litre wine bottle tightly closed . What would be the final pressure in the bottle after all $CO_2$ has been evaporated and temperature reaches to $25^{\large\circ}C$

answered Mar 29, 2014 by sharmaaparna1

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A gas at $0^{\large\circ}C$ and 1 atm pressure occupies 2.5 litre . What change in temperature would be necessary if the pressure is to be adjusted to 1.5 atm and the gas has been transferred to a 2.0 litre container?

answered Mar 29, 2014 by sharmaaparna1

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5g of ethane are confined in a bulb of 1 litre capacity . The bulb is so weak that it will burst if the pressure exceeds 10 atm. At what temperature will be the pressure of gas reach the bursting value?

answered Mar 28, 2014 by sharmaaparna1

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