MCQ
Which of the following is Loschmidt number
  • A
    $6 \times {10^{23}}$
  • $2.69 \times {10^{19}}$
  • C
    $3 \times {10^{23}}$
  • D
    None of these

Answer

Correct option: B.
$2.69 \times {10^{19}}$
b
(b) The no. of molecules present in $1\,ml$ of gas at $STP$ is known as Laschmidt number.

$22400\,ml$ of gas has total no. of molecules $ = 6.023 \times {10^{23}}$

$1\,ml$ of gas has total no. of molecules $ = \frac{{6.023 \times {{10}^{23}}}}{{22400}}$ $= 2.69 \times {10^{19}}$.

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