Use the information in the table to answer the question.

Question

Reaction Bonds Present Energy of Bonds Broken and Formed (kJ/mol)
C + O2 → CO2
O=O

2 C=O

498

1478

N2 + O2 → 2NO
N≡N

O=O

2 N=O

946

498

1214

S + O2 → SO2
O=O

2 S=O

498

1044

2CO + O2 → 2CO2
2 C≡O

O=O

4 C=O

2148

498

2956

Which reaction is endothermic?

Answer 1

The reaction that is endothermic is 2CO + O2 → 2CO2.