1. Some modern cars do not come with an inflated spare tire. The tire is collaps

Question

1. Some modern cars do not come with an inflated
spare tire. The tire is collapsed and needs to be
inflated after it is installed on the car. To inflate
the tire, the car comes with a pressurized can of
carbon dioxide with enough gas to inflate three
tires. What would this can of gas weigh? Assume
an empty can weighs 0.2 kg.

2.) Trout in Lake Huron are an important game fish.
Please assume the following: The concentration of
hexachlorobonserene (HCB) in water from Lake
Huron is 15 ppb, the half-life of HCB in trout is 4
days, and HCB’s log Kow value is 5.43. (a) What is
the steady-state concentration of HCB in Lake
Huron trout in ppm?

(b) Relatively clean trout are
introduced into Lake Huron. How long (in days)
after this event would it take for the concentration
of HCB in these trout to reach 85 ppm?

(c) Clean trout are put in Lake Huron water for 2 weeks, then
transferred to clean water for another week. What is
the concentration (in ppm) of HCB in these fish at
the end of this time?

3. The concentration of tetrachlorocrudene in trout in
Lake Charlotte averages 0.2 ppm; in this lake’swater,
the concentration is 7 ng/L. What is this compound’s
octanol–water partition coefficient?

Explanation / Answer

1) By knowing what amount of CO2 is needed to inflate one tire, we will be able to calculate the weight of can.

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