**The molar mass of Na _{2}SO_{4} is 142.04 g/mol.**

$\mathbf{no}\mathbf{.}\mathbf{}\mathbf{of}\mathbf{}\mathbf{O}\mathbf{}\mathbf{atoms}\mathbf{=}\mathbf{29}\mathbf{.}\mathbf{34}\mathbf{}\overline{)\mathbf{g}\mathbf{}{\mathbf{Na}}_{\mathbf{2}}{\mathbf{SO}}_{\mathbf{4}}}\left(\frac{1\overline{)\mathrm{mol}{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}}}{142.04\overline{)g{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}}}\right)\left(\frac{4\overline{)\mathrm{mol}O}}{1\overline{)\mathrm{mol}{\mathrm{Na}}_{2}{\mathrm{SO}}_{4}}}\right)\left(\frac{6.022\times {10}^{23}O\mathrm{atoms}}{1\overline{)\mathrm{mol}O}}\right)$

Calculate the number of oxygen atoms in 29.34 g of sodium sulfate,Na_{2}SO_{4}.

A. 1.244 × 10^{23} O atoms

B. 4.976 × 10^{23} O atoms

C. 2.409 × 10^{24} O atoms

D. 2.915 × 10^{24} O atoms

E. 1.166 × 10^{25} O atoms

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