Ethene reacts with hydrogen to form ethane. The bond energies are shown in the table. What is the energy change for the reaction?
A.
\(-290 \mathrm{~kJ} / \mathrm{mol}\)
B.
\(-120 \mathrm{~kJ} / \mathrm{mol}\)
C.
\(+120 \mathrm{~kJ} / \mathrm{mol}\)
D.
\(+290 \mathrm{~kJ} / \mathrm{mol}\)
Exam No：0620_w20_qp_21 Year：2020 Question No：17
Answer:
B
Knowledge points:
5.1.8. Calculate the enthalpy change of a reaction using bond energies
Solution:
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