Waec Model Questions Vol1 2017 Chemistry Question 20
Practice objective / multiple choice question 20 from the 2017 Waec Model Questions Vol1 Chemistry examination.
Consider the reaction of solid tetraphosphorus with chlorine gas: P₄(s) + 6 Cl₂(g) → 4 PCl₃(g). The bond dissociation energies are: P-P in P₄ = 200 kJ mol⁻¹ (six such bonds per P₄ molecule), Cl-Cl = 243 kJ mol⁻¹, and P-Cl = 320 kJ mol⁻¹. The enthalpy of vapourisation of P₄(s) to P₄(g) is 30 kJ mol⁻¹. Using these data, calculate the net enthalpy change per mole of PCl₃ formed and state whether the reaction is exothermic or endothermic.
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About This Question
This is Waec Model Questions Vol1 2017 Chemistry Question 20. It is a objective / multiple choice question from the 2017 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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