How many molecules of ammonia gas are present in $67.2 \ dm^3$,measured at $S.T.P.$?
- A$2.0 \times 10^{24}$
- B$1.0 \times 10^{23}$
- C$1.8 \times 10^{24}$
- D$5.0 \times 10^{24}$
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