When a ideal monatomic gas is heated at constant pressure fraction of energy supplied which increases internal energy of gas is
Correct answer: B. 3/5
- A. 2/5
- B. 3/5
- C. 3/7
- D. 5/7
Explanation
Q=U+wU which is internal energy includes intermolecular interactions, vibrational, rotational, translational kinetic energy.In a monatomic its only translational energy so U= 3/2 nRT W=Pv = nRT 3/2 nRT+ nRT =5/2nRTFraction of heat supplied: U/Q 3/2nRT / 5/2nRT = ⅗
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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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