1. Calculate the number of H atoms in 3.8 cm^3 of LiH densisty of LiH =0.79g/cm^3
2. If seawater contains 3.5 mass % of dissolved salts, how many kilograms of salts are present in 2.2 mi^3 of seawater? (1mi = 1609m; density of seawater = 1.025g/cm^3).