Gce Model Questions Vol1 2023 Chemistry Question 49

Practice objective / multiple choice question 49 from the 2023 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2023 Chemistry Objective / Multiple Choice Medium Difficulty
Question 49 GCE_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • objective

The solubility of potassium nitrate (KNO₃) in water is 31.6 g per 100 g water at 20 °C and 56.0 g per 100 g water at 60 °C. Assuming the enthalpy of solution \(\Delta H_{\text{sol}}\) is constant over this temperature range: (a) Calculate \(\Delta H_{\text{sol}}\) in kJ mol\(^{-1}\) using the van't Hoff equation. (b) Estimate the solubility (in g per 100 g water) at 80 °C.

Answer Options

Correct Answer A. ΔH_sol ≈ +11.6 kJ mol⁻¹; solubility at 80 °C ≈ 71 g per 100 g water
B. ΔH_sol ≈ +13.2 kJ mol⁻¹; solubility at 80 °C ≈ 78 g per 100 g water
C. ΔH_sol ≈ +9.3 kJ mol⁻¹; solubility at 80 °C ≈ 64 g per 100 g water
D. ΔH_sol ≈ +10.0 kJ mol⁻¹; solubility at 80 °C ≈ 68 g per 100 g water
Correct Answer
A
Correct Option:
ΔH_sol ≈ +11.6 kJ mol⁻¹; solubility at 80 °C ≈ 71 g per 100 g water

About This Question

This is Gce Model Questions Vol1 2023 Chemistry Question 49. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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