Gce Model Questions Vol1 2021 Chemistry Question 22

Practice objective / multiple choice question 22 from the 2021 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Medium Difficulty
Question 22 GCE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

The sparingly soluble salt \(\ce{MX}\) (M^{2+} and X^{2-}) has a solubility of \(1.2\times10^{-4}\) mol L\(^{-1}\) at 25 °C and \(3.5\times10^{-4}\) mol L\(^{-1}\) at 35 °C. Assuming the enthalpy of solution is constant over this temperature range, (a) calculate \(\Delta H_{\text{sol}}\) in kJ mol\(^{-1}\); (b) estimate the solubility at 45 °C.

Answer Options

A. ΔHₛₒₗ ≈ 90 kJ mol⁻¹; solubility at 45 °C ≈ 5.0×10⁻⁴ mol L⁻¹
B. ΔHₛₒₗ ≈ 200 kJ mol⁻¹; solubility at 45 °C ≈ 1.2×10⁻³ mol L⁻¹
Correct Answer C. ΔHₛₒₗ ≈ 165 kJ mol⁻¹; solubility at 45 °C ≈ 9.6×10⁻⁴ mol L⁻¹
D. ΔHₛₒₗ ≈ 120 kJ mol⁻¹; solubility at 45 °C ≈ 7.2×10⁻⁴ mol L⁻¹
Correct Answer
C
Correct Option:
ΔHₛₒₗ ≈ 165 kJ mol⁻¹; solubility at 45 °C ≈ 9.6×10⁻⁴ mol L⁻¹

About This Question

This is Gce Model Questions Vol1 2021 Chemistry Question 22. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

View More Gce Model Questions Vol1 2021 Chemistry Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support