PROBLEMS 225 7. Susquehanna Valley Limousine has modified their automobile engine to provide heat for an oven to bake fresh chocolate chip cookies while you cruise Lewisburg. For each gallon of gas, 12 MJ of heat is dumped from the engine into the oven at a temperature of 190° C, and the remainder of the heat coming from the engine is dumped to the environment at 70° C, as described in Example 4. Calculate the maximum work possible from a gallon of gas for this engine. As in Example 4, assume that the hot reservoir has a temperature of 820° C and the heat coming from the burning gas totals 120 MJ. TH=820°C W oven environment Tc1 =190° C Tc2: = 70°C Figure 10.8: Engine diagram for Problem 7