Question

The specific heats, Cₚ and Cᵥ of a gas of diatomic molecules, A, are given (in units of J mol⁻¹ K⁻¹) by 29 and 22, respectively. Another gas of diatomic molecules B, has the corresponding values 30 and 21. If they are treated as ideal gases, then:-
(A) A has one vibrational mode and B has two
(B) Both A and B have a vibrational mode each
(C) A is rigid but B has a vibrational mode
(D) A has a vibrational mode but B has none

Answer 1

Answer:

The specific heats, Cₚ and Cᵥ of a gas of diatomic molecules, A, are given (in units of J mol⁻¹ K⁻¹) by 29 and 22, respectively. Another gas of diatomic molecules B, has the corresponding values 30 and 21. If they are treated as ideal gases, then:-

(A) A has one vibrational mode and B has two

(B) Both A and B have a vibrational mode✓✓✓ each

(C) A is rigid but B has a vibrational mode

(D) A has a vibrational mode but B has none

• thanks so

Answer 2

Answer:

The specific heats, Cₚ and Cᵥ of a gas of diatomic molecules, A, are given (in units of J mol⁻¹ K⁻¹) by 29 and 22, respectively. Another gas of diatomic molecules B, has the corresponding values 30 and 21. If they are treated as ideal gases, then:-

(A) A has one vibrational mode and B has two

(B) Both A and B have a vibrational mode each ✔✔

(C) A is rigid but B has a vibrational mode

(D) A has a vibrational mode but B has none