Igcse Model Questions Vol1 2025 Chemistry Question 40

Practice objective / multiple choice question 40 from the 2025 Igcse Model Questions Vol1 Chemistry examination.

Igcse Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Medium Difficulty
Question 40 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective
Igcse Model Questions Vol1 2025 Chemistry Question 40 diagram

In the apparatus shown, a reaction produces a gas that is collected over water in the inverted graduated cylinder. The volume of gas collected is 125.0 mL at 25 °C and a total pressure of 760 mm Hg. The vapour pressure of water at 25 °C is 23.8 mm Hg. (a) Calculate the number of moles of dry gas collected. (b) If the theoretical amount of gas that should have been produced from the reaction is 0.005 mol, determine the percentage error of the experimental measurement.

Answer Options

A. Experimental moles ≈5.20×10⁻³ mol; percentage error ≈4.0 %
B. Experimental moles ≈5.00×10⁻³ mol; percentage error ≈0.0 %
C. Experimental moles ≈4.50×10⁻³ mol; percentage error ≈10.0 %
Correct Answer D. Experimental moles ≈4.95×10⁻³ mol; percentage error ≈1.0 %.
Correct Answer
D
Correct Option:
Experimental moles ≈4.95×10⁻³ mol; percentage error ≈1.0 %.

About This Question

This is Igcse Model Questions Vol1 2025 Chemistry Question 40. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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