WAEC Chemistry 2021 Objective — Question 16
Question 16 of 50 from the West African Examinations Council (WAEC) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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16. What number of moles of oxygen would exert a pressure of 10 atm at 320K in an 8.2dm³ cylinder? [R=0.082 atm dm³mol⁻¹K⁻¹]
- A. 0.32
- B. 1.56
- C. 3.13Correct
- 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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