Q92 / 180 · AIIMS 2006 · Physics

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

  • A
    more in the He filled balloon
  • Correct answer
    B
    same in both balloons
  • C
    more in air filled balloon
  • D
    in the ratio of $1: 4$.

Solution

Assuming the balloons have the same volume, as $P V=n R T$, if $P, V$ and $T$ are the same, $n$, the number of moles present will be the same, whether it is $\mathrm{He}$ or air i.e. nitrogen will be the same.

Hence, the correct answer is option: 'B'.

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