The \( p V \) diagram in (Figure 1) shows a heat engine operating on 0.860 mol of \( \mathrm{H}_{2}\left(C_{V}=20.42 \mathrm{~J} /(\mathrm{mol} \cdot \mathrm{K})\right. \), \( \left.C_{p}=28.74 \mathrm{~J} /(\mathrm{mol} \cdot \mathrm{K})\right) \). Segment \( c a \) is isothermal, and the change in internal energy associated with the \( a b \) segment is \( \Delta U_{a \rightarrow b}=12,190 \mathrm{~J} \).
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Part A
Part B
Part C
Part D
Calculate the thermal efficiency of the engine, assuming the gas is ideal.
Express your answer as a percentage to three significant figures.
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