Van Der Waals Equation

IMPORTANT

Van Der Waals Equation: Overview

This topic covers concepts, such as, Van der Waals Equation for Real Gases, Units of van der Waals Constants, Significance of Van der Waals Constant 'a' & Significance of Van der Waals Constant 'b' etc.

Important Questions on Van Der Waals Equation

HARD
IMPORTANT

The pressure exerted by 1 mole of CO2 at 273 K, is 34.98 atm. Assuming that volume occupied by CO2 molecules is negligible, the value of van der Waals' constant for attraction of CO2 gas is :

EASY
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In Van der Waal’s equation of state for a non-ideal gas, the term that accounts for intermolecular forces is:

EASY
IMPORTANT

When deviation is more in the behaviour of a gas from the ideal gas equation PV = nRT ?

HARD
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Calculate molecular diameter (in nanometer) for a gas if its molar excluded volume is 3.2π ml. Give the answer by multiplying with 10.

(TakeNA=6.0×1023 

EASY
IMPORTANT

Among the following, Van der Waals constant 'a' would be maximum for _____

HARD
IMPORTANT

The van der Waals coefficient a (expressed in atm·dm6·mol-2) for four different gases are: He 0.0341; H2 0.242; Kr 5.125; O2 1.364. Based on the data given above, the gas that will be expected to have the lowest critical temperature Tc:

EASY
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Which of the following expressions is correct between the van der Waals constant b and the radius r of spherical molecules?

EASY
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The Van der Waal's equation for real gases is P+anV2V-nb=nRT

In the above equation, the terms a (n/V)2 and (-nb), respectively represents the corrections for:

HARD
IMPORTANT

For one mole of a van der Waals gas when b=0 and T=300 K, the PV vs I/V plot is shown below. The value of the van der Waals constant 'a' (atm. litre2 mol-2) is
Question Image

MEDIUM
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The term that accounts for intermolecular force in van der Waals' equation for non ideal gas is :

EASY
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1 mole of real gas (a=1.4) occupies a volume of 0.1 L at 300 K, the pressure of gas will be:

EASY
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The correction factor 'a' to the ideal gas equation corresponds to    

EASY
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If V is the volume of one molecule of a gas, the van der waal's constant 'b' is:

MEDIUM
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For a real gas under low pressure conditions, which of the following graph is correct?

MEDIUM
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In Van der Waal equation at constant temperature 300 K, a=1.4 atm lt2 mole-2, v=100 ml, n=1 mole, what is the pressure of gas:

MEDIUM
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In the Vander Waal's equation, 'a' signifies:

MEDIUM
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For real gases, Van der Waals equation is written as.

p+an2V2V-nb=nRT

where 'a' and b are Van der Waals constants.

Two sets of gases are:

I O2, CO2, H2 and He
II CH4,O2 and H2

The gases given in set-I in increasing order of 'b' and gases given in set-II in decreasing order of 'a', are arranged below. Select the correct order from the following:

MEDIUM
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At high temperature and low pressure van der Waal's equation can be expressed as

EASY
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Vander Waal's constants 'a' and 'b' are related with....., respectively.

EASY
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The term that corrects for the attractive forces present in a real gas in the Vander Waals equation is: