Assignment3 - Assignment#3 Due 12:30 pm on Friday No late...

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Assignment #3 Due: 12:30 pm on Friday June 17, 2011. No late assignments will be accepted. 1. In lake water, the toxic compound A degrades into the non-toxic compounds B and C via the one-way chemical reaction: A B + C, with rate constant k1 = 1/ (20 day). None of these compounds occur naturally in the environment. One day, evidence of a spill is reported in Lake Example, where it is found that the concentrations of A, B, and C are respectively 6 μ mol/L, 2 μ mol/L and 2 μ mol/L. Lake Example is rainwater fed, with no river or groundwater sources or sinks; the lake level hasn’t changed for many months. The lake is box-shaped: 150 m long, 100 m wide, and 4 m deep. (a) How large was the initial spill, in moles of A? (b) How long ago was the spill? (c) According to Environment Canada, concentrations of A above 0.25 μ mol/L are unsafe. How long will it take (from the day the spill is discovered) for concentrations of A in Lake Example to reach safe levels, in the absence of rainfall? (d) Compound A reacts with clean-up compound D to form the non-toxic compound E via the one-way elementary chemical reaction A + D
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