In each of A-C, below, indicate whether: a) the statement is possible under the
ID: 983420 • Letter: I
Question
In each of A-C, below, indicate whether: a) the statement is possible under the laws of thermodynamics; b) the statement violates the First Law; c) the statement violates the Second Law. In the case of a Second Law violation, circle the name of the scientist whose version of the second law is most simply and obviously broken. In each case there is a best name, but feel free to explain your choice. (Adapted from Bill Reinhardt.)
A. A novel and reversible heat engine absorbs 10 kJ of energy from a high temperature bath, performs 8 kJ of work on the surroundings, and exhausts 5 kJ of heat into a low temperature heat bath.
a. possible
b. violates First Law
c. violates Second Law: Kelvin Clausius Boltzmann
B. One night you wake up to discover that all the air in your room has gone under your bed. Note that this happens with no change in energy or temperature.
a. possible
b. violates First Law
c. violates Second Law: Kelvin Clausius Boltzmann
C. A novel & reversible heat engine absorbs 10 kJ of energy from a low temperature reservoir, performs 8 kJ of work on the surroundings, and exhausts 2 kJ of energy into a high temperature bath.
a. possible
b. violates First Law
c. violates Second Law: Kelvin Clausius Boltzmann
Explanation / Answer
A. A novel and reversible heat engine absorbs 10 kJ of energy from a high temperature bath, performs 8 kJ of work on the surroundings, and exhausts 5 kJ of heat into a low temperature heat bath.
Answer: The first statement violates the first law of thermodynamics
Reason: Delta U = Q - W, is not satisfied in this reaction
Hence the correct answer is Option B
B. One night you wake up to discover that all the air in your room has gone under your bed. Note that this happens with no change in energy or temperature.
Answer: The first statement violates the second law of thermodynamics
Hence the correct answer is Option C
C. A novel & reversible heat engine absorbs 10 kJ of energy from a low temperature reservoir, performs 8 kJ of work on the surroundings, and exhausts 2 kJ of energy into a high temperature bath.
Answer: This reaction is possible
Hence the correct answer is Option A
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