The van der Walls equation for real gases is given below P = nRT/ V -nb - an^2/V
ID: 981883 • Letter: T
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The van der Walls equation for real gases is given below P = nRT/ V -nb - an^2/V^2 Recall that ideal gases are assumed to not interact or be attracted to each other at all. It is also assumed that ideal gases take up no space (volume) in the container. Real gases, on the other hand, ARE attracted to each other and take up space (volume) in the container. In the vdw equation for real gases, the constants a and b account for these realities. The vdw constant a represents the magnitude of intermolecular attractions, where a higher value represents stronger attractions. Listed below are the van der Waals a parameters for CO_2, CH3_CN, Ne, and CH_4. Use your knowledge of the factors governing the magnitudes of a to assign each of these four gases to its a value. Predict whether a sodium ion will be most strongly attracted to a bromide ion, a molecule of hydrogen bromide, or an atom of krypton.Explanation / Answer
CO2 =3.392 Ne=0.2107 , CH4= 2.253 and CH3CN= 17.58
In vanderwall equation 'a' is a measure of the average attraction between molecules of a gas.Neon is a noble gas and non polar and hence lowest value of a. In CH4 the forces of attraction are covalent. In case of CO2 the forces of attractions are vanderwall forces of attraction while CH3CN is a polar molecule leading to high value of a
b) Due to high elctronegativity difference between sodium ion and bromide ion, it is attracted to Bromide ion.
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