Neco 2019 Chemistry Question 14
Practice objective / multiple choice question 14 from the 2019 Neco Chemistry examination.
The lattice energy of an ionic compound can be approximated by \( U = k \dfrac{z^+ z^-}{r} \), where \( k \) is a constant, \( z^+ \) and \( z^- \) are the charges on the cation and anion, and \( r \) is the inter‑ionic distance (in pm). For \( \text{ACl} \) (where \( z^+ = 1, z^- = 1 \)) the measured lattice energy is 750 kJ·mol⁻¹ and \( r = 260 \) pm. Assuming the same constant \( k \) applies, calculate the lattice energy of \( \text{BCl}_2 \) (where \( z^+ = 2, z^- = 1 \) and \( r = 210 \) pm). Comment on the relative solubility of \( \text{BCl}_2 \) in water compared with \( \text{ACl} \).
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About This Question
This is Neco 2019 Chemistry Question 14. It is one of the objective questions from the 2019 Neco Chemistry examination.
Difficulty level: Medium .
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