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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Rank the following compounds in order of increasing molar enthalpy of vaporization: CH3OH, C2H6, HCl.

Interpretation Introduction

Interpretation: The compounds have to be ranked based on the increasing molar enthalpy of vaporization.

Concept Introduction:

Molar enthalpy of vaporization: The energy required to convert liquid to gas of 1mol of a substance is called molar enthalpy of vaporization

Molar enthalpy of vaporization increases with the intermolecular forces.

Intermolecular force: The attractive force that withholds two molecules is called as intermolecular force. The influence of intermolecular forces depends on molar mass and the functional group present in the molecule.

Hydrogen bonding: The attractive force that holds two polar molecules (containing Hydrogen and highly electronegative atom, such as N, O, or F) is called as hydrogen boding. This is also called as intermolecular hydrogen bonding.

The hydrogen bonding takes place within a molecule is called as intramolecular hydrogen bonding.

Dipole-Dipole Interactions: The attractive force that holds two polar molecules with help of dipole moment present in them is called as Dipole-Dipole Interactions.

The partial positive charge end of one molecule is attracted to the partial negative charge of a neighboring molecule.

Induced Dipole - Induced Dipole Forces: The attractive force that holds two nonpolar molecules with help of temporary dipole moment present in them is called as induced dipole-induced dipole forces.

Explanation

Molar enthalpy of vaporization increases with the intermolecular forces.

The types of intermolecular force in C2H6 are Induced dipole-Induced dipole force and are weak interactions.

The types of intermolecular force in HCl is dipole- dipole interaction

The types of intermolecular force in CH3OH is Induced dipole-Induced dipole force and Dipole-Dipole Interactions and hydrogen boding

Hence, the intermolecular interactions are stronger in

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