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11 July, 09:26

Which energy profile best shows that the enthalpy of formation of cs2 is 89.4 kj/mol?

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  1. 11 July, 12:37
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    Answer is: B. C (s) + 2S (s) + 89.4 kJ → CS2 (l).

    Missing question:

    A. C (s) + 2S (s) → CS2 (l) + 89.4 kJ.

    B. C (s) + 2S (s) + 89.4 kJ → CS2 (l).

    C. C (s) + 2S (s) + 89.4 kJ → CS2 (l) + 89.4 kJ.

    D. C (s) + 2S (s) → CS2 (l).

    Because enthalpy of the system is greater that zero, this is endothermic reaction (chemical reaction that absorbs more energy than it releases), heat is included as a reactant.
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