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PRACTICE / Molecular rms speed

Two gases at the same temperature

Two ideal gases have molar masses 4 g/mol and 36 g/mol and share one temperature.

Find vrms of the lighter gas divided by vrms of the heavier gas.

Organize the givens & assumptions
  • Mlight = 4 g/mol
  • Mheavy = 36 g/mol

Two ideal gases at the same absolute temperature; masses are molar masses in matching units.

  1. A11
  2. B33
  3. C99
  4. D1/31/3

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