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AP EAMCET · PHYSICS · Thermodynamics

An ideal gas has specific heat capacity at constant pressure \(\frac{11}{10} R\). If one mole of this ideal gas at \(125^{\circ} \mathrm{C}\) does \(83 \mathrm{~J}\) of work adiabatically, then the final temperature of the gas would be (Universal gas constant, \(R=8.3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\) )

  1. A \(25^{\circ} \mathrm{C}\)
  2. B \(50^{\circ} \mathrm{C}\)
  3. C \(75^{\circ} \mathrm{C}\)
  4. D \(100^{\circ} \mathrm{C}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(25^{\circ} \mathrm{C}\)

Step-by-step Solution

Detailed explanation

Work done by gas in adiabatic process, \(\Delta W=+83 \mathrm{~J}\) As in adiabatic process, \(\Delta Q=0\), By first law of thermodynamics, \(\Delta Q=\Delta U+\Delta W\) so change in internal energy of gas, \(\Delta U=-83 \mathrm{~J}\) Also, \(\Delta U=n C_V \Delta T=83\)…
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