The oxidation of hydroquinone by hydrogen peroxide in an aqueousenvironment produces quinone and water: C6H4(OH)2(aq) + H2O2(aq)-> C6H4O2(aq) + 2H2O(l) Other related reactions and theircorresponding reaction enthalpies are:
1. C6H4(OH)2(aq) -> C6H4O2(aq) + H2(g)
2. H2(g) + O2(g) -> H2O2(aq)
3. H2(g) + (1/2)O2(g) -> H2O(g)
4. H2O(g) -> H2O(l)
1. ÎH = 177.4 kJ/mol
2. ÎH = -191.2 kJ/mol
3. ÎH = -241.8 kJ/mol
4. ÎH = -43.8 kJ/mol
1. (a) What is the enthalpy change of reaction of the oxidationof hydroquinone by hydrogen peroxide in an aqueous environment, asgiven above? 1. (b) Is the oxidation reaction of hydroquinone byhydrogen peroxide endothermic or exothermic? Briefly justify youranswer in one or two sentences by referring to Îqp of the reaction.-2- 1. (c) What is the standard molar enthalpy of formation ofH2O2(aq)? What is the standard molar enthalpy of formation ofH2O(l)? 1. (d) The enthalpy of an O=O bond is 499 kJ/mol. Using theinformation given, estimate the bond enthalpy of the O-O bond inH2O2(aq). The bonds in H2O2 are: H-O-O-H.
The oxidation of hydroquinone by hydrogen peroxide in an aqueousenvironment produces quinone and water: C6H4(OH)2(aq) + H2O2(aq)-> C6H4O2(aq) + 2H2O(l) Other related reactions and theircorresponding reaction enthalpies are:
1. C6H4(OH)2(aq) -> C6H4O2(aq) + H2(g)
2. H2(g) + O2(g) -> H2O2(aq)
3. H2(g) + (1/2)O2(g) -> H2O(g)
4. H2O(g) -> H2O(l)
1. ÎH = 177.4 kJ/mol
2. ÎH = -191.2 kJ/mol
3. ÎH = -241.8 kJ/mol
4. ÎH = -43.8 kJ/mol
1. (a) What is the enthalpy change of reaction of the oxidationof hydroquinone by hydrogen peroxide in an aqueous environment, asgiven above? 1. (b) Is the oxidation reaction of hydroquinone byhydrogen peroxide endothermic or exothermic? Briefly justify youranswer in one or two sentences by referring to Îqp of the reaction.-2- 1. (c) What is the standard molar enthalpy of formation ofH2O2(aq)? What is the standard molar enthalpy of formation ofH2O(l)? 1. (d) The enthalpy of an O=O bond is 499 kJ/mol. Using theinformation given, estimate the bond enthalpy of the O-O bond inH2O2(aq). The bonds in H2O2 are: H-O-O-H.
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