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2.24 dm^(3) of dry ammonia gas contain 6...

2.24 `dm^(3)` of dry ammonia gas contain `6 x 10^(22)` molecules at S.T .P. Calculate the number of molecules in `56 cm^(3)` of dry nitrogen at S.T.P.

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`(1.5 xx 10^(21) "molecules")`
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