Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

This question requires use of the Data Booklet. Answer this question using bond enthalpy data. The equation below shows the complete combustion of methanal. $ \text{H}_2\text{C}=\text{O} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} $ What is the enthalpy change of combustion for methanal?

  • A$+416\ \text{kJ mol}^{-1}$
  • B$+396\ \text{kJ mol}^{-1}$
  • C$-344\ \text{kJ mol}^{-1}$
  • D$-690\ \text{kJ mol}^{-1}$

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