Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes leading to irreversible inactivity of these enzymes. If the amount of mer- cury in a polluted lake is 0. 4 g hg/ml, what is the total mass in kilograms of mercury in the lake? (the lake has a surface area of 100 mi2 and an average depth of 20 ft. )
