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Change in internal energy when a liquid turns to vapour (Q minus P Delta V)

This type of question, asked 2 times: 16 Apr 2026 S2, 14 May 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    16 Apr 2026 S2

    114
    One gram of a liquid is converted to vapour at 3×1053 \times 10^5 Pa pressure. If 10% of the heat supplied is used for increasing the volume by 1600 cm31600\ \mathrm{cm^3} during this phase change, then the increase in internal energy in the process will be

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  2. Question 2

    14 May 2026 S1

    116
    11 g of water of volume 1 cm31\ \mathrm{cm^3} at 100∘C100^\circ\mathrm{C} is converted into steam of same temperature under normal atmospheric pressure (10510^5 Pa). The volume of steam formed equals 1671 cm31671\ \mathrm{cm^3}. If the latent heat of vaporisation of water is 22562256 J/g, the change in internal energy is

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