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Chapter 17: Problem 43

Select a correct statement of the first law. a) Heat transfer equals the work done for a process. b) Net heat transfer equals the net work for a cycle. c) Net heat transfer equals net work plus internal energy change for a cycle. d) Heat transfer minus work equals change in enthalpy.

Short Answer

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a) Heat transfer equals the work done for a process. b) Net heat transfer equals the net work for a cycle. c) Net heat transfer equals net work plus internal energy change for a cycle. d) Heat transfer minus work equals change in enthalpy. Answer: c) Net heat transfer equals net work plus internal energy change for a cycle.

Step by step solution

01

Option a: Heat transfer equals the work done for a process.

This statement does not account for the internal energy change in the system and may only be true in some specific cases. So, this option is incorrect.
02

Option b: Net heat transfer equals the net work for a cycle.

This statement is almost accurate but does not mention the change in internal energy during the cycle. In case the internal energy change is zero, the first law would reduce to this option. This option is not entirely incorrect but might not be the best representation of the first law.
03

Option c: Net heat transfer equals net work plus internal energy change for a cycle.

This statement perfectly represents the first law of thermodynamics, which states that the energy added to the system in the form of heat transfer is equal to the energy consumed in the form of work and the change in internal energy. This option is correct.
04

Option d: Heat transfer minus work equals change in enthalpy.

This statement is a misrepresentation of enthalpy change (∆H). The correct formula for enthalpy change is: ∆H = heat transfer at constant pressure. This option is incorrect, as it does not represent the first law of thermodynamics. Based on the analysis, the correct statement of the first law of thermodynamics is:
05

Answer

Option c) Net heat transfer equals net work plus internal energy change for a cycle.

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