Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Hydrogen and bromine combine to make hydrogen bromide. $\text{H}_2 + \text{Br}_2 \rightarrow 2\text{HBr}$ The table provides bond energy data. What is the enthalpy change, $\Delta H$, for this reaction?

  • A$-263\,\text{kJ mol}^{-1}$
  • B$-103\,\text{kJ mol}^{-1}$
  • C$+103\,\text{kJ mol}^{-1}$
  • D$+263\,\text{kJ mol}^{-1}$

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