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Consider the following balanced thermochemical equation for a reaction sometimes used for H2S production: 1/8s8(s)+H2(g)---H2S(g) [d]Hrxn=-20.2kJ (a) Is this an exothermic or endothermic reaction? endothermic exothermic (b) What is [d]Hrxn for the reverse reaction? (c) What is [d]H when 4.80 mol of S8 reacts?