Gce Model Questions Vol1 2025 Chemistry Question 40
Practice objective / multiple choice question 40 from the 2025 Gce Model Questions Vol1 Chemistry examination.
The solubility of potassium nitrate (KNO\(_3\)) 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 is constant over this temperature range, calculate the enthalpy change \(\Delta H_{\text{sol}}\) (in kJ·mol\(^{-1}\)). Use the van't Hoff equation \(\ln\frac{K_2}{K_1}= -\frac{\Delta H}{R}\left(\frac{1}{T_2}-\frac{1}{T_1}\right)\) with \(R = 8.314\) J·mol\(^{-1}\)·K\(^{-1}\). Give your answer to two significant figures.
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This is Gce Model Questions Vol1 2025 Chemistry Question 40. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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