Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -235 B -413 C 193 D -49

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Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -235 B -413 C 193 D -493

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Trung Dũng 6 months 2021-07-17T08:08:28+00:00 1 Answers 41 views 0

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    2021-07-17T08:10:19+00:00

    Answer:

    ΔH = 283kJ/mol

    Explanation:

    Using Hess’s law, the ΔH of a reaction is equal to the sum of ΔH° of products times its coefficient subtracting the sum of ΔH° of reactants times its coefficient. Replacing, for the reaction:

    ΔH = 2ΔH°C + 2ΔH°D – (2ΔH°A+ΔH°B)

    ΔH = 2*193kJ/mol + 2*-493kJ/mol – (2*-235kJ/mol+ (-413kJ/mol)

    ΔH = 283kJ/mol

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )