Question

How many degrees of freedom does a diatomic molecule have?

Answer 1

there is a formula for calculating degrees of freedom which is N=3A-R
Where N=number of degree of freedom
A=number of particles in the system
R=number of independent relations among the particles
by putting the values you can calculate the degree of freedom of a diatomic molecule.

Answer 2

N=3A-R

N= 3*2 - 1

 = 6-1

 = 5