What is the Force Constant for Gaseous 14N16O?

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SUMMARY

The discussion centers on calculating the force constant for gaseous 14N16O using the simple harmonic oscillator model. The fundamental vibrational frequency is given as 1904 cm-1, which is identified as a wavenumber rather than a frequency in Hz. The reduced mass (u) is calculated as 1.24e-26 kg/molecule, leading to a force constant (K) of 1.77e-22 kg m2. The conversion from wavenumber to frequency is clarified as necessary for accurate calculations.

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Homework Statement


The fundamental vibrational frequency of gaseous 14N16O is 1904 cm-1.

a. Calculate the force constant, using the simple harmonic oscillator model


Homework Equations



K=u((2pi)(v))^2 u=reduced mass

The Attempt at a Solution



u=[(14)(16)/(30)] (1kg/6.02e^26)= 1.24e^-26 Kg/molecules

K=(1.24e^-26 kg)((2pi)(1904 cm^-1))^2= 1.77e^-22 kg m^2

How do I get the answer in N/m ??
 
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What does it mean when there is a frequency given in cm-1? Frequency should be given in Hz (or per time of some sort). Perhaps instead of "fundamental frequency" they meant "wave number/vector"?
 
cm^-1 is the wavenumber.
 
If you have K = u(2pi*v) why are you plugging in your wave number for v? v is a frequency yes? So how do you convert a wave number into frequency?
 
Ok...

Good point, I will change wave number to frequency.
 

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