Calculate the mass of $0.25 \ mol$ of iron (molar mass $= 56 \ g \ mol^{-1}$).
- A$5.6 \times 10^{-2} \ kg$
- B$1.4 \times 10^{-2} \ kg$
- C$2.8 \times 10^{-2} \ kg$
- D$4.2 \times 10^{-2} \ kg$
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