Determine by calculation and diagrames to proof whether these two reactions are endothermic or exothermic ..

1. Methane burns in oxygen

2. Nitrogen (II) reacting with oxygen producing nitrogen monoxide.

1 answer

I'll do the first one; you do the second.
CH4 + 2O2 --> CO2 + 2H2O
dHrxn = (n*dHf products) - (n*dHf reactants)
If dHrxn is -, rxn is exothermic.
If dHrxn is +, rxn is endothermic.