system has energies E. E. and e, The ate, at energy E is sinsly degenerate, the
ID: 694477 • Letter: S
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system has energies E. E. and e, The ate, at energy E is sinsly degenerate, the first 41. In the datal shown below for the sublimation of G, is triply degenerate, and the erized by the s the different evel afunction, what is the fraction of molecules malonic acid 0.0 be entexcited state at a given temperature, 7 (D molecular degree of freedom typically contributes which to the heat capacity at room temperature? (B) translational (D) electronic 276 28 2 292 100OT (K has a standard entropy of vaporization of A sabstantey 100 J K- mol". At its boiling point of its heat of vaporization is approximately (A) DMMA is more volstile than MMA (B) the sublimation enthalpy of MMA is greater than (C) (D) (B) 13 kJ mol (D) 40 J-mol that of DMMA the sublimation enthalpies of MMA and DMMA are very similar. the sublimation enthalpy of MMA and DMMA both show strong temperature dependence. Reprinted (adapted) with permission hom Manuel A V Ribeiro da Sava, Manuel J. S. Monte, and Jose R. Ribeiro, J. Chem Eng Data, 45,756-799 (2000). Copyright (2000) Amcrican Chenical Sociaty he mole fraction From the one-component phase diagram shown below one can conclude that 42. 3.50 (B) 0.20 (C) 0.40 (D) 0.70 3.00 (A) 0 250 . For a single component phase transition, why are different forms of the integrated Clapeyron equation used fr liquid gas and solid liquid? (A) The normal melting point is much lower than the 2.00 1.50- 1.00 0.00 30 20 460 100 120 Temperature C) B) The enthalpy of fusion is much lower than the (C) The vapor pressure of the substance is lower above (D) -1s much larger than fus-. normal boiling point. enthalpy of vaporization. the solid than the liquid. (A) no solid exists above 4.00 atm (B) the solid is more dense than the liquid. (C) the solid, liquid, and gas coexist at 40°C and 2.5 atm. the chemical potential of the liquid and the vapor are equal at 60°C and 1.8 atm (D)Explanation / Answer
37. Vibrational degree of freedom makes negligible contribution to heat capacity at room temperature. They are neglected because of their low effect on total energy. This low effect is because of very small energy gaps between two vibrational energy levels as compare to rotational and translational energy levels.
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