A diatomic molecule is rotating about its center of mass with an angular speed of 3.90 ✕ 10^12 rad/s. Determine the rotational kinetic energy (in J) of one molecule, if the gas is nitrogen which has a bond length of 1.10 Å and a molecular molar mass of 28.0 g/mole.

Answer :

Answer:

[tex]E_s = 7.35\times 10^{-22}\ J[/tex]

Explanation:

given,

angular speed, ω = 3.90 x 10¹² rad/s

bond length, L = 1.10 Å

molar mass = 28.0 g/mole

Rotational Kinetic energy

[tex]E_s = \dfrac{1}{2} I \omega^2[/tex]

now,

moment of inertia ,[tex]I = \dfrac{1}{2}MR^2[/tex]......(1)

mass of O₂ = m

mass of O = M = m/2

now, mass

[tex]M = \dfrac{28\times 1.67\times 10^{-27}}{2}[/tex]

form equation(1)

[tex]I = \dfrac{1}{2}\times \dfrac{28\times 1.67\times 10^{-27}}{2}\ R^2[/tex]

[tex]I = \dfrac{1}{2}\times \dfrac{28\times 1.67\times 10^{-27}}{2}\ (1.10\times 10^{-10})^2[/tex]

 I = 9.66 x 10⁻⁴⁷ kg.m²

putting value in Rotational kinetic energy equation

[tex]E_s = \dfrac{1}{2}\times 9.66\times 10^{-47}(3.9\times 10^{12})^2[/tex]

[tex]E_s = 7.35\times 10^{-22}\ J[/tex]

Hence, rotational kinetic energy of the molecule is equal to [tex]E_s = 7.35\times 10^{-22}\ J[/tex]

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