Question

Determine the empirical formulas of the compounds with the following compositions by mass: 24.5% Na, 14.9% Si, and 60.6% F

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Each percentage represents the number of grams of an element per 100.0 grams of that compound. Convert these masses to moles using molar masses.

24.5  g  Na1  mol  Na22.99  g  Na=1.07  mol  Na\begin{align*} \begin{array}{c|c} 24.5\;\cancel{\mathrm{g\;Na}}& 1\;\mathrm{mol\;Na}\\ \hline & 22.99\;\cancel{\mathrm{g\;Na}} \end{array} &=1.07\;\mathrm{mol\;Na} \end{align*}

14.9  g  Si1  mol  Si28.09  g  Si=0.530  mol  Si\begin{align*} \begin{array}{c|c} 14.9\;\cancel{\mathrm{g\;Si}}& 1\;\mathrm{mol\;Si}\\ \hline & 28.09\;\cancel{\mathrm{g\;Si}} \end{array} &=0.530\;\mathrm{mol\;Si} \end{align*}

60.6  g  F1  mol  F19.00  g  F=3.19  mol  F\begin{align*} \begin{array}{c|c} 60.6\;\cancel{\mathrm{g\;F}}& 1\;\mathrm{mol\;F}\\ \hline & 19.00\;\cancel{\mathrm{ g\;F}} \end{array} &=3.19\;\mathrm{mol\;F} \end{align*}

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