$A$ sample of a pure compound contains $1.15 \ g$ of sodium,$3.01 \times 10^{22}$ atoms of carbon,and $0.1 \ mol$ of oxygen atoms. Its empirical formula is:
- A$Na_2CO_3$
- B$NaCO_2$
- C$Na_2CO$
- D$NaC_2O$
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