Reaction is exothermic because delta H is negative .
Given,
The balanced thermochemical equation used for H2S production is given by ,
1/8 S8 (s) + H2 (g) --> H2S(g)
∆H rxn = -20.22kj
In this case ∆H ( enthalpy of the reaction) is negative, thus energy is released to the surrounding, loss of energy occurs. thus it is an exothermic reaction.
It is a reaction in which energy is released in the form light or heat . in exothermic reaction energy is liberated to the surroundings .
For exothermic reaction ∆H <0 . means negative .
It is a reaction in which energy is absorbed from the surrounding to the system for continuing the reaction. there is gain of energy occurs. For endothermic reaction ∆H >0 means positive.
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