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Work, pressure or volume for a gas against a constant external pressure (W = -P delta V)

This type of question, asked 17 times: May 2022 S1, 2 May 2023 S1, 4 May 2023 S2, 9 May 2023 S1, 11 May 2023 S1, 15 May 2023 S2, 9 May 2024 S2, 10 May 2024 S1, 20 Apr 2025 S1, 22 Apr 2025 S1, 25 Apr 2025 S1, 25 Apr 2025 S2, 17 Apr 2026 S2, 19 Apr 2026 S1, 12 May 2026 S2, 14 May 2026 S2, 19 May 2026 S1. All 17 questions below, oldest first.

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  1. Question 1

    May 2022 S1

    72
    Calculate the work done when 2 moles of an ideal gas expand from a volume of 5 dm3^3 to 7×10−37 \times 10^{-3} m3^3 against a constant external pressure of 2.02×1052.02 \times 10^5 N m−2^{-2}?

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  2. Question 2

    2 May 2023 S1

    98
    A gas absorbs certain amount of heat and expands by 200200 cm3^3 against a constant external pressure of 2×1052 \times 10^5 N m−2^{-2}. What is work done by system?

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  3. Question 3

    4 May 2023 S2

    61
    One mole of a gas occupying 3 L volume is expanded against a constant external pressure of 1 bar to a volume of 15 L. Calculate work done by the system

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  4. Question 4

    9 May 2023 S1

    95
    Two moles of an ideal gas is expanded isothermally from a volume of 300 cm3300\,\text{cm}^3 to 2.5 dm32.5\,\text{dm}^3 at 298 K against a constant pressure at 1.9 bar. Calculate the work done in joules.

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  5. Question 5

    11 May 2023 S1

    60
    2 moles of an ideal gas expands isothermally from 55 dm3^3 to 1010 dm3^3 at a constant external pressure of 1.5 bar. Calculate work done.

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  6. Question 6

    15 May 2023 S2

    87
    Find the constant external pressure required to expand a gas from 2.5 L to 4.5 L if amount of work done is 500 J at 298 K?

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  7. Question 7

    9 May 2024 S2

    56
    An ideal gas expands by 1.5 L against a constant external pressure of 2 atm at 298 K. Calculate the work done?

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  8. Question 8

    10 May 2024 S1

    73
    Calculate the final volume when 2 moles of an ideal gas expand from 3 dm33\,\text{dm}^3 at constant external pressure 16 bar and the work done in the process is 800 J.

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  9. Question 9

    20 Apr 2025 S1

    61
    Calculate the constant external pressure required to expand 2 moles of an ideal gas from volume 15dm315dm^{3} to 20dm320dm^{3} if amount of work done is -600 J .

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  10. Question 10

    22 Apr 2025 S1

    58
    Calculate the work done in joule if 2 moles of an ideal gas expand isothermally from 15.5dm315.5dm^{3} to 20dm320dm^{3} at constant pressure 1 atm .

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  11. Question 11

    25 Apr 2025 S1

    62
    Calculate the work done in joule if 1 mole of ideal gas is compressed from 25dm325dm^{3} to 13dm313dm^{3} at constant external pressure 4 bar.

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  12. Question 12

    25 Apr 2025 S2

    55
    Calculate the work done in joule if 1 mole of an ideal gas compressed from volume 24dm324dm^{3} to 13dm313dm^{3} at constant external pressure 3 bar.

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  13. Question 13

    17 Apr 2026 S2

    6
    Calculate the quantity of heat released from system when 2 moles of and ideal gas compressed isothermally from volume 25 dm325\ \mathrm{dm^3} to 10 dm310\ \mathrm{dm^3} at constant external pressure 4 bar.

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  14. Question 14

    19 Apr 2026 S1

    10
    An ideal gas expands from initial volume 5 dm35\ \mathrm{dm^3} to 15 dm315\ \mathrm{dm^3} against a constant external pressure of 22 atm. What is the work done by the gas ?

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  15. Question 15

    12 May 2026 S2

    6
    Calculate the work done, when three moles of an ideal gas expand isothermally from 16 dm316\,dm^3 to 20 dm320\,dm^3, at a constant external pressure of 1.51.5 bar.

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  16. Question 16

    14 May 2026 S2

    6
    Calculate the constant external pressure required to compress 44 moles of an ideal gas, from volume 30 dm330\ \mathrm{dm^3} to 20 dm320\ \mathrm{dm^3} when the work obtained is 40534053 J.

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  17. Question 17

    19 May 2026 S1

    7
    A gas expands by 2500 cm32500\ \mathrm{cm^3} against constant external pressure 1.51.5 atm at constant temperature of 300300 K. Calculate the work of expansion in kJ.

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