What will be the mass of one atom of $^{12}C$ in grams?
- A$1.99 \times 10^{-23} \ g$
- B$1.66 \times 10^{-24} \ g$
- C$1.99 \times 10^{-24} \ g$
- D$1.66 \times 10^{-23} \ g$
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