Neco 2022 Chemistry Question 43
Practice objective / multiple choice question 43 from the 2022 Neco Chemistry examination.
In the apparatus shown, 0.500 g of magnesium metal is reacted with excess hydrochloric acid. The hydrogen gas produced is collected over water at 25 \(^{\circ}\)C and a total pressure of 750 mmHg. The water vapour pressure at 25 \(^{\circ}\)C is 23.8 mmHg and the volume of gas collected is 0.350 L. (a) Calculate the number of moles of magnesium that actually reacted. (b) Determine the percent purity of the magnesium sample, assuming the only reaction is \(\mathrm{Mg + 2HCl \rightarrow MgCl_2 + H_2}\).
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About This Question
This is Neco 2022 Chemistry Question 43. It is one of the objective questions from the 2022 Neco Chemistry examination.
Difficulty level: Medium .
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