Question 7
Gas LawsIf 30 cm3 of oxygen diffuses through a porous plug in 7s, how long will it take 60 cm3 of chlorine to diffuse through the same plug? [O = 16, Cl = 35.5]
- A.12s
- B.14s
- C.21s
- D.30s
Show the answer and explanation
Answer: C (21s)
Explanation
By Graham's law, time is proportional to volume × √(molar mass). t = 7 × (60/30) × √(71/32) = 14 × 1.49 ≈ 21 s.