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Use tabulated standard molar enthalpy changes of formation to calculate Delta H rxn for the following...

Use tabulated standard molar enthalpy changes of formation to calculate Delta H rxn for the following (unbalanced) reactions:

SHOW WORK

a. N2O4 (g) + H2 (g) --> N2 (g) + H2O(g)

b. H2S (g) + O2 (g) --> SO2 (g) + H2O(g)

c. Fe2O3 (s) + HCl(g) --> FeCl3 (s) + H2O(g)

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