Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so ?

Which of the two diffuses slower : bromine vapour into air or copper sulphate into water ?

50 mL of hydrogen takes 10 minutes to diffuse out of a vessel. How long will 40 mL of oxygen take to diffuse out under similar conditions ?

Rohit takes 4 4/5 minutes to make a complete round of a circular park. How much time will 5 he take to make 15 rounds

When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.

180ml of hydrogen diffuses through a porous membrane in 15 minutes while 120 ml of SO_(2) under identical conditions diffused in 20 minutes. What is the molecular mass of the hydrocarbon ?

180 mL of a hydrocarbon diffuse through a porous membrane in 15 minutes, while 120 mL of SO_2 under identical conditions diffuse in 20 minutes. What is the molecular mass of the hydrocarbon ?