Igcse Model Questions Vol1 2021 Chemistry Question 13
Practice objective / multiple choice question 13 from the 2021 Igcse Model Questions Vol1 Chemistry examination.
The diagram shows a gas‑collection apparatus in which hydrogen gas produced from magnesium reacting with excess hydrochloric acid is collected over water. The temperature reading is 25 °C, the total pressure is 760 mm Hg and the water‑vapour pressure at this temperature is 23.8 mm Hg. The volume of gas collected is 125 mL. (i) Calculate the number of moles of hydrogen collected. (ii) From this, determine the mass of magnesium that has reacted, given the reaction \(\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2\) and the molar mass of Mg is 24.31 g mol⁻¹.
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This is Igcse Model Questions Vol1 2021 Chemistry Question 13. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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