Problem- Identify the following gas phase reactions as A (spontaneous at all temperatures), B (spontaneous at low temperatures), C (spontaneous as high), or D (spontaneous at no temperature)

Select the letters for each reaction.

1) C3H8 + 5O2 --> 3 CO2 + 4 H2O; delta H rxn = -2044 kJ: A B C D

2) 2 NO2 --> 2 NO + O2; delta H rxn = + 113.1 kJ: A B C D

3) 2 H2+ O2 --> 2H2O; delta H rxn = -483.6 kJ A B C D

State your answer as a chemical formula. Any help is greatly appreciated