The volume of seawater on Earth is about 3.3 x 10^8 mi^3. Because it contains salts, mostly sodium chloride, its density is about 1.03 g/mL, a little higher than that of pure water. The concentration of sodium chloride is about 3.5% by mass.
(a) What is the approximate mass of sodium chloride contained in the oceans, in tons? (1 mile = 1609.344 meters; 1 ton = 907.18474 kg)
(b) What is the molar concentration of sodium chloride in seawater?