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- It is possible to approximate the rotational partition function for diatomic molecules by replacing the infinite sum over states with an integral. Why might this be less accurate for H₂? OH₂ has a smaller mass so its rotational constant will be very small. OH₂ has a very high vibrational frequency so the spacings between its energy levels will be large. O the moment of inertia for H₂ is OH₂ has a shorter bond length so its rotational constant will be very small. the integral diverges for smaller-sized diatomic molecules.Give an example of 2 isomers of a molecule that have different values of the rotational partition function at the same temperature.What is the numerical value of the molecular partition function of a heteronuclear diatomic molecule given the following conditions: (i) the characteristic length is 10 nm and the volume in which the molecules are free to move is a cube with sides of 1 mm each. (ii) Only the first four rotational levels are accessible, but for some odd reason [to keep things simple] each state in each of those levels is equally populated. (iii) all molecules are in the ground vibrational state; (iv) the molecule has a triplet electronic ground level, like 02.
- Calculate the ratio of the translational partition functions of H2 and He at the same temperature and volume.Consider a diatomic molecule that is highly susceptible to centrifugal distortion in its ground vibrational state. Do you expect excitation to high rotational energy leve ls to change the equilibrium bond length of this molecule? Justify your answer.Calculate the moment of inertia for hcl molecule from the given value of rotational constant
- Which of the following molecules should have pure rotational spectra? a Deuterium, D2 D is 2H b Carbon monoxide, CO c cis1,2Dichloroethylene d trans1,2Dichloroethylene e Chloroform, CHCl3 f Buckminsterfullerene, C60Which of the following molecules should have pure rotational spectra? a Dimethyltriacetylene, H3CCCCCCCCH3 b Cyanotetraacetylene, HCCCCCCCCCN Such molecules have been detected in intersteller space. c Nitric oxide, NO d Nitrogen dioxide, NO2 e Sulfur tetrafluoride, SF4 f Sulfur hexafluoride, SF6What is overall molecular partition function Q, and how it is constructed using the partition functions for each energetic degree of freedom?