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?

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?