Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Ethene combines with hydrogen to produce ethane. The bond energies are listed in the table. C-C: $+350\,\text{kJ mol}^{-1}$ C-H: $+410\,\text{kJ mol}^{-1}$ H-H: $+436\,\text{kJ mol}^{-1}$ C$\equiv$C: $+614\,\text{kJ mol}^{-1}$ What is the energy change for this reaction?

  • A$-290\,\text{kJ mol}^{-1}$
  • B$-120\,\text{kJ mol}^{-1}$
  • C$+120\,\text{kJ mol}^{-1}$
  • D$+290\,\text{kJ mol}^{-1}$

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