$A$ 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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