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12 Dec 2019

What is the standard enthalpy of reaction for 2H2(g) + O2(g)-->2H20(g)?

please show calculations. When I did them I got +483kj/mol if O-H is 463kj/mol and H2 is 497kj/mol and O2 is 436kj/mol. the answer should be -483kj/mol however. The formula is reactant - products right?

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Elin Hessel
Elin HesselLv2
13 Dec 2019

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Related questions

2H2(g)+O2(g)----->2H2O(g) ?H=-484 KJ



How much PV work is done, and what is the value of ?E for thereaction of .50 mol of H2 with .25 mol of O2 at atmposphericpressure if the volume change is -5.6L?


I know delta E=DeltaH *PDeltaV, but how do I find PV work, andwhere do I use mols?

Please answer and explain!

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. ΝH = 177.4 kJ/mol
2. ΝH = -191.2 kJ/mol

3. ΝH = -241.8 kJ/mol

4. ΝH = -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 Νqp 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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