Gce Model Questions Vol1 2019 Chemistry Question 42
Practice objective / multiple choice question 42 from the 2019 Gce Model Questions Vol1 Chemistry examination.
A sample of hydrogen gas is collected over water at \(25^{\circ}\text{C}\). The total volume measured is \(0.850\ \text{dm}^{3}\) and the total pressure is \(750\ \text{mmHg}\). The vapour pressure of water at \(25^{\circ}\text{C}\) is \(23.8\ \text{mmHg}\). (i) Calculate the number of moles of dry hydrogen collected. (ii) If the hydrogen was produced by the reaction of excess zinc metal with excess hydrochloric acid according to \(\mathrm{Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}}\), determine the mass of zinc that reacted. Use \(R = 0.0821\ \text{L·atm·mol}^{-1}\text{K}^{-1}\).
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This is Gce Model Questions Vol1 2019 Chemistry Question 42. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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