Multiple choice

A gas occupies a volume of 250 mL at 700 mm mercury pressure and 25oC temperature. What is the additional pressure required to reduce the gas volume to its 4/5th value at the same temperature?

  1. 125 mm Hg

  2. 150 mm Hg

  3. 175 mm Hg

  4. 200 mm Hg

  5. 225 mm Hg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

P1 = 700 mm Hg, V1 = 250 mL, V2 = 250 (4/5) = 200 mL, P2 =? According to the Boyle’s law: P1V1 = P2V2   P2 = 250 × 700 / 200 = 875 mm Hg Required additional pressure = 875 – 700 = 175 mm Hg

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