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- Calculating Partition Functions. Consider the acetylene molecule, which is linear and has the chemical structure H−C≡C−H. Calculate or determine the following: a. Symmetry number (?) and degrees of freedom b. Moment of inertia (I) and rotational temperature (Θr) c. Vibrational temperatures (Θv,i) d. Translational (qt), rotational (qr), vibrational (qv), and electronic (qe) partition functions at 298 K. e. Total partition function, (q/V). Helpful information: mass of H atom = 1.007947 amu mass of C atom = 12.01078 amu C≡C bond length = 1.203 Å C−H bond length = 1.060 Å vibrational frequencies = 1975, 3370, 3277, 729 (2), 600 (2) cm-1 (numbers in parenthesis indicate the degeneracy of that mode) ground state electronic degeneracy = 1The boat conformation of cyclohexane (1) lies 22 kJ mol-1 higher in energy than the chair conformation (2). Calculate the partition function for the cyclohexane molecule, confining attention to these two con formations only. Show how the partition function varies with temperature.The ground configuration of oxygen gives rise to the three levels 3P2, 3P1, and 3P0 at 0, 158.5. and 226.5 cm-1, respectively. (a) Before doing any calculation, state the value of the partition function at T = 0. (b) Write an expression for the partition function at temperature T. Remember that a level with quantum number J has 2J + 1 states. Confirm that its value at T = 0 is what you anticipated. (c) Calculate the value of the partition function at 298 K. (d) Derive an expression for the electronic contribution to the molar heat capacity of an oxygen atom and plot it as a function of temperature. (e) Eva luate the expression at 25 °C.
- Show that bimolecular reactions between nonlinear molecules are much slower than between atoms even when the activation energies of both reactions are equal. Use transition-state theory and make the following assumptions. (1) All vibrational partition functions are close to 1; (2) all rotational partition functions are approximately 1 × 101.5; (3) the translational partition function for each species is 1 × 1026. Hint: Equation 18C.9 is a good starting point.For one mole of Br2 (molar mass 159.82 g/mol, vibrational frequency 325 cm-1,rotational constant 0.082 cm-1, nondegenerate ground electronic state) gas at 400 Kand 1 bar, calculate the molecular rotational partition function.A) 1,695B) 3,390C) 4,560D) 5,735E) 6,256 Please type answer note write by hendDetermine the molecular partition function, ?.
- Consider a volume V filled with N atoms of monatomic ideal gas. What is the Helmholtz energy of this system? (Be sure to substitute the form of any relevant partition function(s) from your formula sheet). BasedontheThermodynamicsquare,whatistherelationshipbetweenHelmholtz energy and pressure. (Give a general thermodynamic expression not involving the par- tition function.) Combineyourprevioustwoanswerstogenerateasimplifiedexpression(involving no derivatives) for the pressure of the ideal monatomic gasThe rotational partition function for a sample of carbonyl sulfide (OCS) is found to be 25.0. Above roughly what J value do we expect to see the population (the number of molecules per J level) rapidly decreasingWhat is overall molecular partition function Q, and how it is constructed using the partition functions for each energetic degree of freedom?
- Plot the temperature dependence of the vibrational contribution to the molecular partition function for several values of the vibrational wavenumber. Estimate from your plots the temperature at which the partition function falls to within 10 per cent of the value expected at the high-temperature limit.The bond length of N2 is 109.75 pm. Use the high-temperature approximation to calculate the rotational partition function of the molecule at 300 K.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 O2.