Use standard enthalpies of formation to determine ΔHorxn for:

3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

Enter in kJ.

Use standard enthalpies of formation to determine ΔHorxnfor:

2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l)

Enter in kJ.

Find the change in internal energy for this reaction. Enter in kJ.

Use standard enthalpies of formation to determine ΔHorxn for:

2NH3(g) + 3O2(g) + 2CH4(g) → 2HCN(g) + 6H2O(g)

Enter in kJ.