(a) How many grams of ethanol, $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ , should you dissolve in water to make 1.00 $\mathrm{L}$ of vodka (which is an aqueous solution that is 6.86 $\mathrm{M}$ ethanol)? (b) Using the density of ethanol $(0.789 \mathrm{g} / \mathrm{mL}),$ calculate the volume of ethanol you need to make 1.00 $\mathrm{L}$ of vodka.