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absorption peak for CO is at ~2142 cm-1...therefore the force constant would be

k=4*pi2*c2*v2*(m1*m2/(m1+m2))

where c is the speed of light in cm/s (2.99792458 x 1010 cm/s)

v is the vibrational frequency in cm-1 (2142 cm-1) and m1 and m2 are the masses of the atoms (m1=0.0120 kg/mol/6.0221415 x1023 1/mol, m2=0.01601 kg/mol/6.0221415 x1023 1/mol)

entering all of this yields k~1854 N/m

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