Calculate the enthalpy of the reaction 2NO(g)+O2(g)?2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)?NO2(g),Â Â Â ?H?A=33.2 kJ 12N2(g)+12O2(g)?NO(g),Â Â ?H?B=90.2 kJ Express...

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Chemistry

Calculate the enthalpy of the reaction
2NO(g)+O2(g)?2NO2(g)
given the following reactions and enthalpies of formation:
12N2(g)+O2(g)?NO2(g),Â Â Â ?H?A=33.2 kJ
12N2(g)+12O2(g)?NO(g),Â Â ?H?B=90.2 kJ
Express your answer with the appropriate units.
?H? =
Part B
Calculate the enthalpy of the reaction
4B(s)+3O2(g)?2B2O3(s)
given the following pertinent information:
B2O3(s)+3H2O(g)?3O2(g)+B2H6(g),Â Â Â Â ?H?A=+2035kJ
2B(s)+3H2(g)?B2H6(g),Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ?H?B=+36kJ
H2(g)+12O2(g)?H2O(l),Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ?H?C=?285kJ
H2O(l)?H2O(g),Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ?H?D=+44kJ
Express your answer with the appropriate units.
?H? =

Answer & Explanation Solved by verified expert

3.6 Ratings (583 Votes)

The Hess law is used to discover the reactions entalphy and doing it you must cancel the same substances if they are in differents sides to make the given reaction Remember that if you multiply or divide the reaction the same happens with the entalphy and when you invert the reaction the entalphys sign must be also inverted The first one is easy but the second one took me some work 1 The reaction you have is 2 NO O2 2 NO2 It means that 2 NO and O2 must be See Answer

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