Waec Model Questions Vol1 2019 Chemistry Question 30

Practice objective / multiple choice question 30 from the 2019 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 30 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

The solubility of AgCl in water is 1.33 × 10⁻⁵ mol L⁻¹ at 25 °C and 1.50 × 10⁻⁵ mol L⁻¹ at 35 °C. Assuming the dissolution equilibrium AgCl(s) ⇌ Ag⁺ + Cl⁻ follows the van't Hoff relationship, (i) estimate the standard enthalpy change ΔH° (in kJ mol⁻¹) for the dissolution, and (ii) predict the solubility of AgCl at 45 °C (in mol L⁻¹, to three significant figures).

Answer Options

Correct Answer A. ΔH° ≈ +18 kJ mol⁻¹; solubility ≈ 1.68×10⁻⁵ mol L⁻¹
B. ΔH° ≈ +18 kJ mol⁻¹; solubility ≈ 1.50×10⁻⁵ mol L⁻¹
C. ΔH° ≈ +22 kJ mol⁻¹; solubility ≈ 1.80×10⁻⁵ mol L⁻¹
D. ΔH° ≈ +12 kJ mol⁻¹; solubility ≈ 1.55×10⁻⁵ mol L⁻¹
Correct Answer
A
Correct Option:
ΔH° ≈ +18 kJ mol⁻¹; solubility ≈ 1.68×10⁻⁵ mol L⁻¹

About This Question

This is Waec Model Questions Vol1 2019 Chemistry Question 30. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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