Which among the following statements is incorrect a

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Unformatted text preview: le or not. f) During the reversible adiabatic expansion of an ideal gas, the pressure, volume and temperature change. Question 4: (5 points) Consider the following non- linear molecules H2O, NH3, and the linear molecules H- C≡C- H and F- F. Which among the following statements are incorrect? a) Water has three times the number of vibrational degrees of freedom of fluorine b) Acetylene has one more vibrational degree of freedom than ammonia c) The total number of degrees of freedom of acetylene is twice that of fluorine d) The total number of vibrational degrees of freedom for these four molecules is equal to nineteen e) Water and ammonia have more rotational degrees of freedom than fluorine and acetylene 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) When the same amount of heat is transferred at constant pressure to two substances such as C6H14 and C8H18, the temperature rise is greater for C6H14 than for C8H18. b) 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. c) The molar heat capacity of C6H14 is greater than that of C8H18 assuming they are measured at the same temperature, pressure and for the same phase. d) A process is spontaneous if it can occur without the need for work to be done on the system. 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 standard formation enthalpy of oxygen gas is equal to zero at all reaction temperatures. c) The heat of reaction in an adiabatic bomb calorimeter is equal to the reaction enthalpy change. d) The temperature change observed in an adiabatic bomb calorimeter is always positive whenever an exothermic reaction takes place. e) In an adiabatic bomb...
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