A 250 cm3 flask of glass filled with seawater weighs 350 g. Calculate the density of seawater if the empty flask weighs 100 g.

• A. 7⁄5 g⁄cm3
• B. 5⁄7 g⁄cm3
• C. 1 g⁄cm3
• D. 2⁄5 g⁄cm3