Neco 2019 Chemistry Question 44

Practice objective / multiple choice question 44 from the 2019 Neco Chemistry examination.

Neco 2019 Chemistry Objective / Multiple Choice Medium Difficulty
Question 44 NECO • 2019 • CHEMISTRY • objective
Neco 2019 Chemistry Question 44 diagram

In the apparatus shown, 0.500 g of magnesium ribbon reacts with excess hydrochloric acid. The hydrogen gas produced is collected over water at 25\(^\circ\)C and a total pressure of 750 mmHg. The gas syringe reading is 125 mL. (a) Calculate the moles of H_{2} collected. (b) Determine the theoretical mass of H_{2} that could be produced from the given magnesium. (c) Find the percent yield of the experiment.

Answer Options

A. Moles H_{2}=0.00513 mol; theoretical H_{2} mass=0.0415 g; percent yield=24.9 %
Correct Answer B. Moles H_{2}=0.00489 mol; theoretical H_{2} mass=0.0415 g; percent yield=23.8 %
C. Moles H_{2}=0.00505 mol; theoretical H_{2} mass=0.0415 g; percent yield=24.6 %
D. Moles H_{2}=0.00489 mol; theoretical H_{2} mass=0.0208 g; percent yield=47.5 %
Correct Answer
B
Correct Option:
Moles H_{2}=0.00489 mol; theoretical H_{2} mass=0.0415 g; percent yield=23.8 %

About This Question

This is Neco 2019 Chemistry Question 44. It is one of the objective questions from the 2019 Neco Chemistry examination.

Difficulty level: Medium .

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