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AP EAMCET202022 Sep 2020Morning ShiftPhysicsKinetic Theory of GasesActual

Pressure of a gas of constant volume at 20^ C is 90 ~cm of Hg . At what temperature the pressure would change to 75 ~cm of Hg ?

Options

  1. A233.2^ C
  2. B-28.8^ C
  3. C-24.2^ C
  4. D28.8^ C

Correct answer

B. -28.8^ C

Step-by-step solution

Given, aligned & T₁=(273+20) K =293 ~K & p₁=90 ~cm of Hg & p₂=75 ~cm of Hg aligned Since, volume of the gas is constant. Hence, according to ideal gas equation, aligned p₁ T₁ & = p₂ T₂ T₂ & = T₁ p₂ p₁ = 293 75 90 & =244.16 ~K =244.16-273=-28.8^ C aligned

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