The internal energy of an ideal gas depends on:
Correct answer: C. Temperature only
- A. Pressure only
- B. Volume only
- C. Temperature only
- D. Pressure and volume
Explanation
For an ideal gas, internal energy is a function of temperature only, as U = (f/2)nRT, where f is degrees of freedom, n is moles, R is the gas constant, and T is temperature.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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A gas expands adiabatically, and its temperature decreases. The work done is:
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