Elements Of Physical Chemistry
Elements Of Physical Chemistry
7th Edition
ISBN: 9780198727873
Author: ATKINS, P. W. (peter William), De Paula, Julio
Publisher: Oxford University Press
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Chapter 1, Problem 1.11P
Interpretation Introduction

Interpretation:

Value of the van der Waals parameter “b” by calculating the molar volume excluded by methane molecules should be estimated.

Concept Introduction:

Intermolecular forces are Van der Waals forces.  They are weak and have three types viz., London dispersion forces, dipole-dipole forces and hydrogen bonding. Hydrogen bonding is relatively the strongest one.

  • Intermolecular forces are the forces acting between molecules whereas Intramolecular forces are the forces that operate within a molecule.
  • Hydrogen bonding is a special type of Dipole-dipole forces but stronger than the former.
  • London dispersion forces exist in non-polar covalent compounds whereas dipole-dipole forces exist in polar covalent compounds but both are weak.
  • Larger the molecular size, stronger the London dispersion force.
  • Arrangement of major types of intermolecular forces in increasing order of strength:

  Londondispersionforces<Dipole-dipoleforces<Hydrogenbonding

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