Changes in Bond Energy Quick Check
5 of 55 of 5 Items
Question
Use the information in the table to answer the 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?
(1 point)
2CO + O2 → 2CO2
2CO + O 2 → 2CO 2
S + O2 → SO2
S + O 2 → SO 2
N2 + O2 → 2NO
N 2 + O 2 → 2NO
C + O2 → CO2
C + O 2 → CO 2
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1 answer
The reaction N2 + O2 → 2NO is endothermic because the energy of the bonds broken (946 kJ/mol) is greater than the energy of the bonds formed (498 kJ/mol + 1214 kJ/mol = 1712 kJ/mol).
1 answer