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The enthalpy of formation (Hf) of H2S at -20.6 kJ/mol indicates that the formation of H2S from its elements (hydrogen and sulfur) is an exothermic reaction. In an energy profile, this would be represented by a diagram showing the reactants at a higher energy level than the products (H2S), with a downward slope indicating the release of energy. Additionally, the activation energy barrier would be visible, representing the energy required to initiate the reaction, but the overall change in energy would reflect the negative enthalpy value.

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2mo ago

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