Question

Calculate the standard enthalpies of the following reactions from the standard molar enthalpies of formation of the reactants and products. Identify if the reaction is endothermic or exothermic.

 

1.   2NH₃ (g) + 3N₂O (g)                   4N₂ (g) + 3H₂O (l)            ΔH_rxn = __________

2.   CaO₃(s)               CaO (s) + CO₂(g)                                ΔH_rxn = __________

3.   C (graphite) + O₂(g)             CO₂(g)                                 ΔH_rxn = __________

Answer 1

1. Endothermic

2. Exothermic