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Concepts Of Physics MCQ Edition [Volume 2]PhysicsKinetic Theory of Gases

Determine the mass of 1 cm ^3 of oxygen maintained at STP.

Options

  1. A1.43 g
  2. B1.43 mg
  3. C1.25 mg
  4. D0.71 mg

Correct answer

B. 1.43 mg

Step-by-step solution

Volume of 1 mole of an ideal gas at STP is 22.4 L = 22400 cm ^3 . Molar mass of oxygen gas ( O₂ ) is 32 g . Mass of 22400 cm ^3 of oxygen at STP is 32 g . Mass of 1 cm ^3 of oxygen at STP is 32 22400 g . 32 22400 g = 1 700 g 1.43 10⁻³ g = 1.43 mg .

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