PYQ Vault
EbooksTutor

Work in isothermal reversible expansion of an ideal gas

This type of question, asked 4 times: 27 Jun 2022, 31 Jan 2024, 4 Apr 2025, 28 Jan 2026 S1. All 4 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    27 Jun 2022

    144
    When 5 moles of He gas expand isothermally and reversibly at 300 K300\text{ }K from 10 litre to 20 litre, the magnitude of the maximum work obtained is ____\_\_\_\_ JJ. [nearest integer] (Given: R=8.3 J K−1 mol−1R = 8.3\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} and log⁡2=0.3010)\log2 = 0.3010)

  2. Question 2

    31 Jan 2024

    150
    If 5 moles of an ideal gas expands from 10 L10\text{ }L to a volume of 100 L100\text{ }L at 300 K300\text{ }K under isothermal and reversible condition then work, ww, is −x J-x\text{ }J. The value of xx is ______ . (Given R=8.314 J K−1 mol−1R = 8.314\text{ }J{\text{ }K}^{- 1}{\text{ }mol}^{- 1} )

  3. Question 3

    4 Apr 2025

    30
    One mole of an ideal gas expands isothermally and reversibly from 10dm310dm^{3} to 20dm320dm^{3} at 300 K300\text{ }K. ΔU\Delta U, q and work done in the process respectively are Given : R=8.3 JK−1mol−1R = 8.3\ JK^{- 1}mol^{- 1}, ln⁡10=2.3\ln 10 = 2.3, log⁡2=0.30, log⁡3=0.48\log2 = 0.30,\ \log3 = 0.48

    Tap an option to check your answer.

  4. Question 4

    28 Jan 2026 S1

    26
    20.0dm320.0dm^{3} of an ideal gas ' X ' at 600 K and 0.5 MPa undergoes isothermal reversible expansion until pressure of the gas is 0.2 MPa . Which of the following option is correct? (Given: log⁡2=0.3010\log2 = 0.3010 and log⁡5=0.6989\log5 = 0.6989 )

    Tap an option to check your answer.