Waec Model Questions Vol1 2017 Chemistry Question 26
Practice objective / multiple choice question 26 from the 2017 Waec Model Questions Vol1 Chemistry examination.
The formation of an ionic solid MX from its elements proceeds through the following steps: \n1) M(s) → M(g) ΔH₁ = +150 kJ mol⁻¹ (atomisation) \n2) M(g) → M⁺(g) ΔH₂ = +500 kJ mol⁻¹ (first ionisation) \n3) X₂(g) → 2X(g) ΔH₃ = +250 kJ mol⁻¹ (bond dissociation) \n4) X(g) + e⁻ → X⁻(g) ΔH₄ = -350 kJ mol⁻¹ (electron affinity) \n5) M⁺(g) + X⁻(g) → MX(s) ΔH₅ = ? (lattice energy, exothermic) \nThe standard enthalpy of formation of MX(s) is -200 kJ mol⁻¹. Calculate the magnitude of the lattice energy released in step 5.
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About This Question
This is Waec Model Questions Vol1 2017 Chemistry Question 26. It is one of the objective questions from the 2017 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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