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a
6×1023
b
2.69×1019
c
3×1023
d
None of these
answer is B.
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Detailed Solution
The no. of molecules present in 1ml of gas at STP is known as Loschmidt number. 22400 ml of gas has total no. of molecules=6.023×10231ml of gas has total no. of molecules =6.023×102.322400=2.69×1019.