Neco 2020 Chemistry Question 31
Practice objective / multiple choice question 31 from the 2020 Neco Chemistry examination.
In the apparatus shown, a piece of magnesium ribbon reacts with excess hydrochloric acid. The hydrogen gas produced is collected over water at \(25^{\circ}\mathrm{C}\) and atmospheric pressure of \(760\ \text{mm\,Hg}\). The water vapour pressure at this temperature is \(23.8\ \text{mm\,Hg}\). The volume of gas collected is \(0.845\ \text{L}\). Assuming the reaction goes to completion, calculate the mass of magnesium that reacted. (Molar mass of Mg = 24.305 g mol⁻¹, R = 0.0821 L·atm·mol⁻¹·K⁻¹).
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About This Question
This is Neco 2020 Chemistry Question 31. It is one of the objective questions from the 2020 Neco Chemistry examination.
Difficulty level: Medium .
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