The number of molecules in 22.4dm^(3) of...

The number of molecules in `22.4dm^(3)` of nitrogen gas at STP is _____

A

`6.022 xx 10^20`

B

`6.022 xx 10^23`

C

`22.4 xx 10^20`

D

`22.4 XX 10^23`

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