Question

At a constant temperature volume of a gas was found to be 400 m cube at a pressure of 760 mm of HG if the pressure of the gas is increased by 25% find the new volume

Answer 1

P V = μ R T

720 mm * 250 ml = μ1 * R T  = P1 * 1000 ml       - Nitrogen
       P1 = 180 mm

650 mm * 380 ml = μ2 * R T  = P2 * 1000 ml    -  oxygen
           P2 = 247 mm

Pressure of mixture = P1 + P2 as per Dalton's law of partial pressures
       = 180 + 247 mm = 427 mm of Hg

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