An aqueous solution of 0.216 M ethanol. CH3CHOH, has a density of 0.996 g/mL. The percent by mass of CH3CHOH in the solution is %. An aqueous solution of 0.975 M hydrochloric acid, HCI, has a density of 1.02 g/mL. The percent by mass of HCI in the solution is %. An aqueous solution is 22.0% by mass ethanol, CH3CHOH, and has a density of 0.966 g/mL. The molarity of ethanol in the solution is M.