What will be the mass of one atom of ${}^{12}C$?
- A$1 \ \text{a.m.u.}$
- B$1.9923 \times 10^{-23} \ \text{g}$
- C$1.6603 \times 10^{-22} \ \text{g}$
- D$6 \ \text{a.m.u.}$
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