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E the second law of thermodynamics can be expressed

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Unformatted text preview: twice that of fluorine d) Acetylene has three fewer vibrational degrees of freedom than methane e) The total number of vibrational degrees of freedom for these four molecules is equal to twenty f) Water has the same number of translational, vibrational and rotational degrees of freedom 1 Question 5: (5 points) Which among the following statements is incorrect? a) A process is spontaneous if it can occur without the need for work to be done on the system. b) The molar heat capacity of C8H18 is greater than that of C6H14 assuming they are measured at the same temperature, pressure and for the same phase. c) The molar heat capacity at constant pressure increases with temperature around room temperature for most molecules because, as the temperature increases, these molecules can access more vibrational energy levels. d) When the same amount of heat is transferred at constant pressure to two substances such as C8H18 and C6H14, the temperature rise is greater for C8H18 than for C6H14. e) The second law of thermodynamics can be expressed as dS > δq / T for all spontaneous processes. f) For a reversible process, the change in entropy of the surroundings is opposite in sign and equal in magnitude to that of the system. Question 6: (5 points) Which among the following statements is incorrect? a) The most reliable method for the calculation of enthalpies of reaction uses enthalpies of formation. b) The heat of reaction in an adiabatic bomb calorimeter is equal to...
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This note was uploaded on 01/26/2014 for the course CHEM 3615 taught by Professor Aresker during the Spring '07 term at Virginia Tech.

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