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BITSAT2014PhysicsThermodynamicsActual

Two balloons are filled one with pure he gas and other with air respectively. If the pressure and temperature of these balloons are same, then the number of molecules per unit volume is

Options

  1. Amore in He gas filled balloon
  2. Bsame in both balloons
  3. Cmore in air filled balloon
  4. Din the ratio 1: 4

Correct answer

B. same in both balloons

Step-by-step solution

Assuming the balloons have the same volume, as pV = nRT . If P , V and T are the same, n the number of moles present will be the same, whether it is He or air. Hence, number of molecules per unit volume will be same in both the balloons.

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