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68. Which statement is incorrect? a. At constant pressure, H = E + PV b. The thermodynamic symbol for entropy is S. c. Gibbs free energy is a state function. d. For an endothermic process, H is negative. e. If the work done by the system is greater than the heat absorbed by the system, E is negative. 69. Which statement is false? a. The thermodynamic quantity most easily measured in a "coffee cup" calorimeter is H. b. No work is done in a reaction occurring in a bomb calorimeter. c. H is sometimes exactly equal to E. d. H is often nearly equal to E. e. H is equal to E for the reaction. 70-75. (3 PTS) What makes a good fuel? Give the characteristics of a good fuel. 76-78. (3 PTS) Give the advantages and disadvantages of using Biodiesel as an alternative source of fuel nowadays