Question

The rotational spectrum of 79Br19F shows a series of equidistant lines 0.71433 cm 1 apart. Calculate the rotational constant, B, the moment of inertia I for the molecule, and the bond length of the Br-F bond. Estimate the wavenumber at which the J = 9 ? J = 10 transition will occur.

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Answer 1

Answer:

78563

Explanation:

because it was at calculate at this no. 79b so that

Answer 2

Answer:

B=0.11 cm-1, it is ig in 10~-1

Explanation:

Yah so B=0.71433/2.

Once you have got B its linked to moment of inertia by the equation

B=h^2/(8pisquared) I

h=plancks constant

I=moment of inertia

B=rotational constant

So if you rearrange you will get I

then if you use the other equation I=Mr^2

you can rearrange it to get r which is the bond length.

in thats equation

I-moment of inertia

M=mu

r^2=bond length squared

to get M use M1M2/(M1+M2) where M1 and M2 are the Mr of both atoms. to get M though you have to divide your answer by 1000 and then avagadros number.