A solution of cough syrup contains 5.00% active ingredient by the volume of the bottle is 18.0 mL, how many mililiters of the active ingredient are in the bottle?

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[tex]18mL \ \ \ \ \rightarrow \ \ \ 100\%\\ V_{x} \ \ \ \ \ \ \ \ \rightarrow \ \ 5\%\\\\ V_{x}=\frac{18mL*5\%}{100\%}=0,9mL[/tex]