Answer:
Particles move faster the farther they are apart, so the container with the most spread out particles.
This question is Graham’s law. It states that one molecule will diffuse X times faster than another molecule, where x = square root (high atomic mass / low atomic mass). If you plug in hydrogen and helium’s masses, it’s root(4/1), or 2. That means hydrogen is twice as fast a helium, so helium will take 32 hours
I am not sure but if you google the question it brings up a table :P
