Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Methane is burned in excess oxygen. The equation is given as: $\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$. Bond energies are shown. What is the energy change for this reaction?

  • A$(4 \times 410 + 2 \times 496) - (2 \times 805 + 4 \times 460)$
  • B$(2 \times 805 + 4 \times 460) - (4 \times 410 + 2 \times 496)$
  • C$(410 + 2 \times 496) - (805 + 2 \times 460)$
  • D$(410 + 496) - (805 + 460)$

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