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.
Answer Options
About This Question
This is Waec Model Questions Vol1 2017 Chemistry Question 20. It is one of the objective questions from the 2017 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.