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Edexcel A-Level Chemistry A2 12.17 Energy Cycles and Energy Level Diagrams to Calculate the Enthalpy Change of Solution of an Ionic Compound Questions

Practise choosing and writing thermochemical equations for atomisation, electron affinity and lattice energy definitions.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • select the equation for atomisation using one mole of gaseous atoms from standard states
  • distinguish first and second electron affinity equations using charge and state symbols
  • explain trends in electron affinity using atomic radius, shielding and electron repulsion

Edexcel A-Level Chemistry A2 12.17 Energy Cycles and Energy Level Diagrams to Calculate the Enthalpy Change of Solution of an Ionic Compound Questions question 1

[Maximum number: 2]

This question concerns calcium chloride, CaCl2\mathrm{CaCl}_{2}.

Calculate the enthalpy change of solution of calcium chloride, CaCl2\mathrm{CaCl}_{2}.

Data
Δhyd H⊖(Ca2+)=−1650 kJ mol−1Δhyd H⊖(Cl−)=−364 kJ mol−1\Delta_{\text {hyd }} H^{\ominus}\left(\mathrm{Ca}^{2+}\right)=-1650 \mathrm{~kJ} \mathrm{~mol}^{-1} \quad \Delta_{\text {hyd }} H^{\ominus}\left(\mathrm{Cl}^{-}\right)=-364 \mathrm{~kJ} \mathrm{~mol}^{-1}
Experimental lattice energy (CaCl2)=−2258 kJ mol−1\left(\mathrm{CaCl}_{2}\right)=-2258 \mathrm{~kJ} \mathrm{~mol}^{-1}
(2)

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