Neco Model Questions Vol1 2021 Chemistry Question 37
Practice objective / multiple choice question 37 from the 2021 Neco Model Questions Vol1 Chemistry examination.
The solubility of a solid salt at 25 °C is \(S_1 = 0.20\) mol L\(^{-1}\) and at 35 °C is \(S_2 = 0.30\) mol L\(^{-1}\). Assuming the enthalpy of solution \(\Delta H_{\text{sol}}\) is temperature‑independent, estimate the solubility at 45 °C (\(S_3\)) using the van't Hoff relation \(\ln\frac{S_2}{S_1}= -\frac{\Delta H_{\text{sol}}}{R}\left(\frac{1}{T_2}-\frac{1}{T_1}\right)\). Take \(R = 8.314\) J mol\(^{-1}\) K\(^{-1}\). Give your answer in mol L\(^{-1}\) to two decimal places.
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This is Neco Model Questions Vol1 2021 Chemistry Question 37. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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