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

Using the figure, determine the boiling point of methyl alcohol at 1 atm ( 760 mm of mercury) and at 0.5 atm .

Options

  1. A65^ C , 48^ C
  2. B78^ C , 55^ C
  3. C48^ C , 65^ C
  4. D100^ C , 82^ C

Correct answer

A. 65^ C , 48^ C

Step-by-step solution

The boiling point of a liquid is the temperature at which its vapour pressure equals the external atmospheric pressure. For methyl alcohol, the normal boiling point at 1 atm ( 760 mm of Hg) is known to be 65^ C . When the external pressure is reduced to 0.5 atm ( 380 mm of Hg), the boiling point decreases. Based on the standard vapour pressure curve of methyl alcohol, the temperature at which its vapour pressure is 0.5 atm is 48^ C . Thus, the boiling points are 65^ C and 48^ C respectively.

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