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Indian Navy SSR (Sailor) Thermodynamics & Kinetic Theory — practice questions

Explore 1 free Thermodynamics & Kinetic Theory questions in Indian Navy SSR (Sailor) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Thermodynamics & Kinetic Theory questions and exercises with answers

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For an isothermal reversible expansion of an ideal gas from volume $V_1$ to $V_2$, the work done **by** the gas is:Read the answer and worked solution →

Worked practice questions

For an isothermal reversible expansion of an ideal gas from volume $V_1$ to $V_2$, the work done **by** the gas is:

  1. $-2.303\,nRT\,\log\dfrac{V_2}{V_1}$
  2. $+2.303\,nRT\,\log\dfrac{V_2}{V_1}$
  3. $0$
  4. $-p_\text{ext}(V_2 - V_1)$
Show answer and solution

Correct answer: B. $+2.303\,nRT\,\log\dfrac{V_2}{V_1}$

For an isothermal reversible expansion, $W_\text{by gas} = +nRT\ln(V_2/V_1) = +2.303\,nRT\log(V_2/V_1)$. In the IUPAC convention $W_\text{on system} = -nRT\ln(V_2/V_1)$ is negative, but the question asks for work done *by* the gas, which is the positive of this.

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