isothermal 5. Calculating the efficiency of the engine. Problem Shown in the figure to the right is a cyclic process undergone by a heat engine. Your heat engine shall use 7.0 moles of nitrogen gas (diatomic). During the process a->b, the pressure rises by a factor of 3.0. a V T = 300 K Pa = 100,000 Pa Engine Cycle Solution (1) Fill in the State Table (all pressures in Pascals, all Pressure Volume Temperature volumes in cubic meters, all temperatures in K). a Work Heat du a->b (2) Fill in the Process Table (all entries in Joules). b- >c C - > a Work = (3) Find the Totals: Heat = du = (4) Find the heat input (from "hot reservoir") and Q-hot = the heat output (to "cold reservoir"): Q-cold = (5) Find the efficiency of the engine: efficiency = %