Waec Model Questions Vol1 2021 Chemistry Question 20
Practice objective / multiple choice question 20 from the 2021 Waec Model Questions Vol1 Chemistry examination.
A solution is prepared by dissolving 5.00 g of methanol (CH₃OH, M = 32.04 g mol⁻¹) in 100.0 g of water. The observed boiling point of the solution is 100.5 °C. Assuming the boiling‑point elevation follows \(\Delta T_b = i\,K_b\,m\) with \(K_b\) for water = 0.512 °C·kg mol⁻¹ and that methanol does not ionise (i = 1), (a) calculate the expected boiling‑point elevation and state whether the observation is consistent; (b) if not, determine the apparent molal boiling‑point constant \(K_{b,\text{app}}\) that would give the observed elevation.
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This is Waec Model Questions Vol1 2021 Chemistry Question 20. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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