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A porous partition separates two compartments. Compartment 1 contains at and compartment 2 contains at , both at the same temperature. Which statements are correct for the initial stage of diffusion?

  1. A crosses into compartment 2 four times faster than crosses into compartment 1
  2. BThe pressure in compartment 2 initially rises
  3. CThe pressure in compartment 1 initially falls
  4. DThe number of molecules crossing per second is the same in both directions

Answer: A, B, C

Rates with equal : (A). More molecules enter compartment 2 than leave it, so its pressure rises (B) and that of compartment 1 falls (C). The flows are unequal, so (D) is wrong.
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