Concentrated sulfuric acid is roughly an 18 molar solution. To prepare 500 mLs of a 3 M solution, mLs of sulfuric acid should be. ANSWER OPTIONS: A) 166.6; added to a 500 mL volumetric flask with water already in it. B) 83.3; added to a 500 mL volumetric flask with water already in it. C) 83.3; added to an empty 500 mL volumetric flask. D) 166.6; added to an empty 500 mL volumetric flask.