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Change in internal energy when a gas absorbs heat and expands against a constant external pressure

The same question, asked 9 times: 2 May 2023 S2*, 10 May 2023 S2*, 11 May 2023 S1*, 10 May 2024 S2*, 12 May 2024 S2*, 13 May 2024 S2*, 13 Apr 2026 S2*, 19 Apr 2026 S1*, 20 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S2

    70
    If 100 L gas is enclosed in a cylinder, absorbs 302.6 J of heat and expands to 200 L against constant external pressure of 2 atm. Calculate internal energy change of the gas.

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  2. Question 2

    10 May 2023 S2

    88
    A gas expands isothermally against a constant external pressure of 1 bar from 10 dm310\,\text{dm}^3 to 20 dm320\,\text{dm}^3 by absorbing 800 J of heat from surrounding. Calculate value of ΔU\Delta U.

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  3. Question 3

    11 May 2023 S1

    67
    An ideal gas expands against constant external pressure of 2 bar from 5 lit to 8 lit and absorbs 10 kJ of heat. What is ΔU\Delta U of the system?

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  4. Question 4

    10 May 2024 S2

    85
    A gas absorbs 200 J heat and expands by 500 cm3^3 against a constant external pressure 2×105 N m−22\times10^5\,\text{N m}^{-2}. What is the change in internal energy?

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  5. Question 5

    12 May 2024 S2

    91
    A gas absorbs 150 J heat and expands by 300300 cm³ against a constant external pressure 2×1052 \times 10^5 N m⁻². What is ΔU\Delta U of the system?

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  6. Question 6

    13 May 2024 S2

    85
    An ideal gas absorbs 210 J of heat and undergoes expansion from 3 L to 6 L against a constant external pressure of 105 Pa10^5\ \text{Pa}. What is the value of ΔU\Delta U?

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  7. Question 7

    13 Apr 2026 S2

    6
    A gas expands from a volume of 1 dm31\ \mathrm{dm^3} to 1.25 dm31.25\ \mathrm{dm^3} under a pressure of 11 bar. Find the change in internal energy if 150150 J of heat is supplied to the system.

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  8. Question 8

    19 Apr 2026 S1

    9
    A gas absorbs 120120 J of heat and expands by 300×10−6 m3300 \times 10^{-6}\ \mathrm{m^3} against a constant external pressure of 2×105 Nm−22 \times 10^5\ \mathrm{Nm^{-2}}. What will be the change in internal energy of the system ?

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  9. Question 9

    20 Apr 2026 S2

    6
    Calculate the change in internal energy if an ideal gas expands from 0.5 dm30.5\ \mathrm{dm^3} to 3.5 dm33.5\ \mathrm{dm^3} at constant pressure 2 bar by absorbing 1800 J heat energy.

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