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Delta H versus delta U for a reaction from the change in moles of gas

This type of question, asked 6 times: 9 May 2023 S1, 9 May 2024 S1, 9 May 2024 S2, 12 May 2024 S1, 15 Apr 2026 S2, 16 Apr 2026 S1. All 6 questions below, oldest first.

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  1. Question 1

    9 May 2023 S1

    52
    For the reaction, C3H8(g)+5O2(g)→3CO2(g)+4H2O(l)\text{C}_3\text{H}_8(\text{g}) + 5\text{O}_2(\text{g}) \rightarrow 3\text{CO}_2(\text{g}) + 4\text{H}_2\text{O(l)} at constant temperature, ΔH−ΔU\Delta H - \Delta U is

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  2. Question 2

    9 May 2024 S1

    71
    Which among the following reactions exhibits ΔH=ΔU\Delta H=\Delta U?

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  3. Question 3

    9 May 2024 S2

    63
    What is the value of ΔH−ΔU\Delta H - \Delta U for the following reaction? 2C(s)+3H2(g)→C2H6(g)2\text{C(s)} + 3\text{H}_2\text{(g)} \to \text{C}_2\text{H}_6\text{(g)}

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  4. Question 4

    12 May 2024 S1

    66
    For reaction CO(g)+12O2(g)→CO2(g)\text{CO}_{(g)}+\frac{1}{2}\text{O}_{2(g)}\rightarrow\text{CO}_{2(g)}. Which of the following equations is CORRECT at constant T and P?

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  5. Question 5

    15 Apr 2026 S2

    9
    Find Δn\Delta n when 1 mol of each NH3(g)\mathrm{NH_{3(g)}} and HCl(g)\mathrm{HCl_{(g)}}, reacts to form solid NH4Cl\mathrm{NH_4Cl}.

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  6. Question 6

    16 Apr 2026 S1

    9
    Which of the following relations is correct for a reaction S(s)+O2(g)→SO2(g)\mathrm{S_{(s)} + O_{2(g)} \rightarrow SO_{2(g)}} ?

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