Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

The equation for the reaction between hydrogen and oxygen is shown. $2\text{H}_2(g) + \text{O}_2(g) \rightarrow 2\text{H}_2\text{O}(l)$ Which expression represents the standard enthalpy change for this reaction?

  • A$2 \times \Delta H_f^\circ(\text{H}_2\text{O})$
  • B$\Delta H_c^\circ(\text{H}_2\text{O}) - \Delta H_c^\circ(\text{H}_2)$
  • C$\Delta H_c^\circ(\text{H}_2)$
  • D$2 \times \Delta H_f^\circ(\text{H}_2\text{O}) + 2 \times \Delta H_c^\circ(\text{H}_2)$

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