We are given the mass % of each.

Recall the **mass percent formula**:

$\overline{){\mathbf{\%}}{\mathbf{}}{\mathbf{mass}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{component}}{\mathbf{total}\mathbf{}\mathbf{mass}}{\mathbf{\times}}{\mathbf{100}}}$

$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{component}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{\%}}{\mathbf{100}}{\mathbf{\times}}{\mathbf{mass}}{\mathbf{}}{\mathbf{of}}{\mathbf{}}{\mathbf{sample}}}$

**percent sodium: 39%**

If someone consumes 23 g of sodium chloride per day, what mass (in grams) of sodium does that person consume? Sodium chloride is 39 % sodium by mass.

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