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Sticky Note
At the same temperature and pressure two identical balloons were separately filled with oxygen and hydrogen. If O2 escaped at the rate of 100ml per second the hydrogen will escape at rate of _____?
  1. 800 ml per second
  2. 400 ml per second
  3. 160 ml per second
  4. None of these
Explanation
  • The rate of effusion follows Graham’s law: Rate ∝ 1/√Molar mass.
  • Since H₂ (2 g/mol) is lighter than O₂ (32 g/mol), it escapes √(32/2) = 4 times faster, meaning 100 × 4 = 400 ml/sec.

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