Gce Model Questions Vol1 2022 Chemistry Question 48

Practice objective / multiple choice question 48 from the 2022 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 48 GCE_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

\(2.00\ \text{g}\) of magnesium metal is reacted with excess aqueous hydrochloric acid. The hydrogen gas produced is collected over water at \(298\ \text{K}\) and \(740\ \text{mmHg}\), and the volume collected is \(0.850\ \text{L}\). (a) Determine the number of moles of magnesium that have reacted. (b) Calculate the theoretical volume of hydrogen gas at STP that could be produced from the original \(2.00\ \text{g}\) of magnesium. (c) Find the percent yield of hydrogen based on the volume actually collected (corrected to STP).

Answer Options

A. a) 0.0300 mol Mg (≈0.732 g); b) 1.70 L H₂ at STP; c) 42.0 % yield
Correct Answer B. a) 0.0328 mol Mg (≈0.797 g); b) 1.85 L H₂ at STP; c) 39.8 % yield
C. a) 0.0400 mol Mg (≈0.976 g); b) 1.20 L H₂ at STP; c) 28.3 % yield
D. a) 0.0250 mol Mg (≈0.610 g); b) 2.30 L H₂ at STP; c) 49.5 % yield
Correct Answer
B
Correct Option:
a) 0.0328 mol Mg (≈0.797 g); b) 1.85 L H₂ at STP; c) 39.8 % yield

About This Question

This is Gce Model Questions Vol1 2022 Chemistry Question 48. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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