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NEET 2016
Exam
NEET
Year
2016
Subject
Chemistry
Chapter
Thermodynamics (C)

NEET 2016 · Chemistry · Thermodynamics (C)

For a sample of perfect gas, when its pressure is changed...

For a sample of perfect gas, when its pressure is changed isothermally from pi{p}_{i} to pf{p}_{f}, the entropy change is given by

Options

  1. A∆S=nRln(pfpi)∆ S = nRln \left(\dfrac{{p}_{f}}{{p}_{i}}\right)
  2. B∆S=nRln(pipf)∆ S = nRln \left(\dfrac{{p}_{i}}{{p}_{f}}\right)
  3. C∆S=nRTln(pfpi)∆ S = nRTln \left(\dfrac{{p}_{f}}{{p}_{i}}\right)
  4. D∆S=RTln(pipf)∆ S = RTln \left(\dfrac{{p}_{i}}{{p}_{f}}\right)

Correct answer

B. ∆S=nRln(pipf)∆ S = nRln \left(\dfrac{{p}_{i}}{{p}_{f}}\right)

Step-by-step solution

For a sample of perfect gas, when its pressure is changed isothermally from pi{p}_{i} to pf{p}_{f}, the entropy change is given by ∆S=nRln(pipf)∆ S = nRln \left(\dfrac{{p}_{i}}{{p}_{f}}\right)

Here, pi{p}_{i} stands for initial pressure and pf{p}_{f} stands for the final pressure.

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