Answer :
Container A will have a faster rate of diffusion across its membrane because particles in diffusion tend to occur faster with high differences in concentration.
Diffusion is a method of transport of particles of solute in a solvent across a membrane which moves from a direction of higher concentration to a lower concentration. Since the difference in concentration across the membrane in container A is high thus the particle tends to maneuver faster in order to attain a state of equilibrium in a system.
Diffusion occurs in liquids and gases when their particles collide randomly and opened up. It's an important process for living cells as it is a method of transport across in and out of cells.
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