Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

Standard enthalpy changes of combustion may be used to calculate enthalpy changes of formation. The equation below shows the standard enthalpy change of formation of butane. $4\text{C(s)} + 5\text{H}_2(\text{g}) \rightarrow \text{C}_4\text{H}_{10}(\text{g})$ Using the standard enthalpy of combustion data given below, determine the value of the standard enthalpy change of formation, $\Delta H_f^\circ$, for this reaction.

  • A$-5883\,\text{kJ mol}^{-1}$
  • B$-129\,\text{kJ mol}^{-1}$
  • C$+129\,\text{kJ mol}^{-1}$
  • D$+2197\,\text{kJ mol}^{-1}$

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI