Which one is true for internal energy?
Correct answer: D. All are correct
- A. It is sum of all forms of molecular energies of a system
- B. It is proportional to translational K.E of the molecules
- C. It is a state function of a system
- D. All are correct
Explanation
All options are related to internal energy. Internal energy of a system with well defined boundaries, is the total of the kinetic energy due to the motion of molecules and the potential energy associated with the vibrational motion and electric energy of atoms within molecules.
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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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