WAEC Chemistry 2022 Objective — Question 29
Question 29 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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What number of moles of oxygen would exert a pressure of 10 atm at 320K in an 8.2 dm³ cylinder? [R = 0.082 atm dm³ mol⁻¹ K⁻¹]
- A. 0.32 B
- B. 1.52 C
- C. 3.13 DCorrect
- D. 31.25
Explanation
Using PV = nRT: n = PV/RT = (10 × 8.2)/(0.082 × 320) = 82/26.24 = 3.13 mol.
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