Neco 2024 Chemistry Question 20

Practice objective / multiple choice question 20 from the 2024 Neco Chemistry examination.

Neco 2024 Chemistry Objective / Multiple Choice Medium Difficulty
Question 20 NECO • 2024 • CHEMISTRY • objective
Neco 2024 Chemistry Question 20 diagram

A 2.50 L container at 298 K holds a mixture of nitrogen and oxygen gases at a total pressure of 1.20 atm. When the mixture is passed over heated copper, nitrogen is removed, and the pressure falls to 0.78 atm (temperature unchanged). Determine the mole fraction of oxygen in the original mixture and the mass of oxygen present initially.

Answer Options

A. Mole fraction O₂ = 0.70; Mass of O₂ = 2.79 g
B. Mole fraction O₂ = 0.35; Mass of O₂ = 1.37 g
Correct Answer C. Mole fraction O₂ = 0.65; Mass of O₂ = 2.55 g
D. Mole fraction O₂ = 0.55; Mass of O₂ = 2.20 g
Correct Answer
C
Correct Option:
Mole fraction O₂ = 0.65; Mass of O₂ = 2.55 g

About This Question

This is Neco 2024 Chemistry Question 20. It is one of the objective questions from the 2024 Neco Chemistry examination.

Difficulty level: Medium .

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