A container with a porous wall is filled with He, H2, N2, and CO2. Which one of these gases will diffuse out of the container in the least time
Answer: H2
Explanation
According to Graham’s Law of Diffusion, gases with lower molar mass diffuse faster.
Molar masses:
- H₂ = 2 g/mol (lowest)
- He = 4 g/mol
- N₂ = 28 g/mol
- CO₂ = 44 g/mol
Since H₂ has the smallest molar mass, it will diffuse the fastest and thus escape in the least time.
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