Question

Calculate DrH for the combustion of ammonia,
4 NH3(g) + 7 O2(g) 4 NO2(g) + 6 H2O()
using standard molar enthalpies of formation.
molecule DfH (kJ/mol-rxn)
NH3(g) -45.9
NO2(g) +33.1
H2O() -285.8
A.+30.24 kJ/mol-rxn
B.-206.9 kJ/mol-rxn
C.-298.6 kJ/mol-rxn
D.-1398.8 kJ/mol-rxn
E.-1663.6 kJ/mol-rxn

Answer

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