An Ideal Heat Engine Uses 0

question 17

Multiple Choice

An ideal heat engine uses 0.01 mole of gas and operates between a hot reservoir at T_H = 400 K and cold reservoir at T_L = 300 K, in a cycle from a→b→c→d→a. From a→b the gas undergoes an isothermal expansion, changing its volume from V_a to 2.5V_a. From b→c, the pressure is reduced at a constant volume. From c→d, the gas undergoes an isothermal compression, and from d→a, the pressure is increased at a constant volume until the gas is back at the original condition at a. How much heat is absorbed in going from a→b?

• A) 30.5 J
• B) 7.62 J
• C) 22.9 J
• D) 8.31 J
• E) 0.917 J

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