Calculate the mass in $kg$ of $2.5 \ mol$ of ammonia.
- A$5.10 \times 10^{-2} \ kg$
- B$4.25 \times 10^{-2} \ kg$
- C$1.72 \times 10^{-2} \ kg$
- D$3.44 \times 10^{-2} \ kg$
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