Liquid alum is prepared by dissolving aluminum sulfate [Al2(SO4)3] in water. Liquid alum is commonly delivered to a drinking water treatment plant by tanker truck or rail car. Properties of liquid alum are as follows: Al content: 4.1% by weight pH: 2.0-2.4 Specific gravity: 1.335 A. In liquid alum, what is the Al concentration in units of mg/L? B. How many gallons of liquid alum would a water treatment plant have to add each day if the target Al concentration in the water to which the liquid alum is added is 5 mg/L and the plant treats 50 mgd? C. How many tanker truck loads need to be delivered to the water treatment plant if the tank of one tanker truck holds 4000 gal?