Mass of one molecule of oxygen in $amu$ and in $gram$ respectively is
- A$32 \ u, 53.13 \times 10^{-24} \ g$
- B$16 \ u, 6.0 \times 10^{-24} \ g$
- C$42 \ u, 5.313 \times 10^{-24} \ g$
- D$53.13 \times 10^{-24} \ u, 32 \ g$
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