Choose the reaction in which H is not equal to U

  1. A

    C(gr)+O2(g)CO2(g)

  2. B

    C2H4(g)+H2(g)C2H6(g)

  3. C

    2C(gr)+H2(g)C2H2(g)

  4. D

    H2(g)+I2(g)2HI(g)

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    Solution:

    ΔH=ΔU+ΔnRT When Δng=0 then ΔH=U

    For (a) ,Δng=0

    (B)Δng=12=1 (CΔng=0 (D)Δng=22=0 (E) Ang=22=0

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