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Hess's Law Worksheet Name:

______ __________________



1. Calculate H for the reaction 4 NH3 (g) + 5 O2 (g) 4 NO (g) + 6 H2O (g), from
the following data.

N2 (
g)
+ O2 (
g)
2 NO (
g) H =
180.
5 kJ

N2 (
g)
+…

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Heat of Formation Worksheet
Use a standard enthalpies of formation table to determine the change in enthalpy for each of
these reactions.



a) NaOH(s) + HCl(g) > NaCl(s) + H2O(g)




b) 2 CO(g) + O2(g) > 2 CO2(g)



c) CH4(g) + 2 O2(g) > CO2(g) + 2 H2O(l)



d) 2…

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H2SO4(l) 811.3 NO2(g) +33.9

MgSO4(s) 1278.2 SnCl4(l) 545.2

MnO(s) 384.9 SnO(s) 286.2

MnO2(s) 519.7 SnO2(s) 580.7

NaCl(s) 411.0 SO2(g) 296.1

NaF(s) 569.0 SO3(g) 395.2

NaOH(s) 426.7 ZnO(s) 348.0

NH3(g) 46.2 ZnS(s) 202.9

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