(A): The heat capacities of all the diatomic molecules...

Name: Problem 161, Chapter 2: Physical Chemistry for IIT JEE
Uploaded: 2022-02-26T18:03:54-08:00
Duration: 53 s
Channel: Rashmi Gondi
Description: (A): The heat capacities of all the diatomic molecules attain a limiting value at higher temperatures. (R): At room temperature, the translational and rotational degrees of freedom contribute to the heat capacities of gases, while the vibrational degree of freedom becomes active only at higher temperatures.

(A): The heat capacities of all the diatomic molecules attain a limiting value at higher temperatures. (R): At room temperature, the translational and rotational degrees of freedom contribute to the heat capacities of gases, while the vibrational degree of freedom becomes active only at higher temperatures.

(A): The heat capacities of all the diatomic molecules attain a limiting value at higher temperatures.
(R): At room temperature, the translational and rotational degrees of freedom contribute to the heat capacities of gases, while the vibrational degree of freedom becomes active only at higher temperatures.

Key Concepts

Translational Motion

Translational motion involves the movement of a molecule's center of mass in three-dimensional space. This movement is a fundamental contribution to a molecule's heat capacity and exists in all gas particles regardless of temperature.

Rotational Motion

Rotational motion pertains to the spinning of a molecule around its axes. In many molecules, including diatomic ones, rotational degrees of freedom contribute to the heat capacity at lower temperatures, as they require relatively little energy to be activated.

Heat Capacity

Heat capacity is a measure of the amount of energy required to raise the temperature of a substance and is influenced by the energy storage in various molecular motions. It reflects how molecular degrees of freedom contribute to the internal energy of a system.

Degrees of Freedom

Degrees of freedom refer to the independent ways in which a system can store energy, such as through translational, rotational, and vibrational motions. They determine how a molecule absorbs and distributes thermal energy, influencing properties like heat capacity.

Vibrational Motion

Vibrational motion involves the periodic relative movements of atoms within a molecule, such as stretching and bending of bonds. These degrees of freedom typically need higher thermal energies to be activated and contribute to the heat capacity mainly at elevated temperatures.

Transcript

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