Question 21
Gas LawsIf 30cm3 of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?
- A.9.3 sec
- B.14 sec
- C.21 sec
- D.28 sec
- E.30.3 sec
Show the answer and explanation
Answer: C (21 sec)
Explanation
By Graham's law, time is proportional to √(density) for the same volume. 30 cm3 of chlorine takes 7 × √(36/16) = 7 × 1.5 = 10.5 s, so 60 cm3 takes 21 s.