Igcse Model Questions Vol1 2022 Chemistry Question 10

Practice objective / multiple choice question 10 from the 2022 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 10 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

Magnesium metal reacts with excess hydrochloric acid according to \(Mg + 2HCl \rightarrow MgCl_2 + H_2\). A sample of 5.00 g Mg is used and the hydrogen gas produced is collected over water at 25 °C and 750 mmHg. The gas volume measured is 0.850 L. (a) Calculate the theoretical volume of \(H_2\) at STP. (b) Determine the percent yield of hydrogen obtained. (Assume the vapour pressure of water at 25 °C is 23 mmHg and 1 atm = 760 mmHg.)

Answer Options

A. Theoretical volume = 4.61 L; percent yield ≈ 25 %
Correct Answer B. Theoretical volume = 4.61 L; percent yield ≈ 16 %
C. Theoretical volume = 5.12 L; percent yield ≈ 20 %
D. Theoretical volume = 3.90 L; percent yield ≈ 16 %
Correct Answer
B
Correct Option:
Theoretical volume = 4.61 L; percent yield ≈ 16 %

About This Question

This is Igcse Model Questions Vol1 2022 Chemistry Question 10. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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