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3 marksEnergetics

CAPE Chemistry Unit 1 · 2008 · Paper 2 · Question 1(b)(ii)

Figure 1 shows an energy level diagram for determining the enthalpy of solution of KBr.

Calculate the enthalpy of solution for KBr, given the following information. ΔH₁ = + 672 kJ mol⁻¹ ΔH₂ = - 656 kJ mol⁻¹

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  1. 1(a)(i)Define the term 'standard enthalpy of formation', ΔHᶠθ.[2 marks]
  2. 1(a)(ii)The enthalpy of formation of both carbon monoxide and aluminium oxide cannot be determined directly by experimental means. Suggest ONE reason in EACH case for…[2 marks]
  3. 1(b)(i)Write the enthalpy change represented by ΔH₁, ΔH₂ and ΔH₃ in Figure 1. ΔH₁ : ΔH₂ : ΔH₃ :[3 marks]
  4. 1(c)(i)What kind of bonding is present in halides of X?[2 marks]
  5. 1(c)(ii)What kind of bonding is present in halides of Y?[1 mark]
  6. 1(d)(i)Identify THREE errors in the above method.[3 marks]

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