The first line (peak) in the rotational spectrum of 12CO is observed at 3.84235 cm^-1 (corresponds to the transition J=0 >J=1).

Calculate B, the rotational constant of 12CO (in cm^-1).

Calculate r, the bond length of 12CO (at A).

Calculate the position (wavenumber, in cm) of the peak corresponding to the J=0 >J=1 transition of 13CO. Molar masses (g/mol): 12C=12.00, 13C=13.0006, O=15.9994.

1. The rotational constant is B = ___ cm^-1

2. The bond length is r= ____ A.

3. In the spectrum, the transition J=0 >J=1 of the isotope 13CO appears at ____ cm^-1.

2.1 x 1020 6.5 0.95 0.77 3.67 11,000 2.3 x 10-20 3200 1.92 1.7 x 10-9 6.67 1.131