# A Few “Complex” Problems ```A Few “Complex” Problems
1. The most abundant element in seawater is chlorine. Seawater
contains 19,000 mg of chlorine per liter. Calculate this as g /
cubic meter.
2. The average density of the total earth is 5.52 g/cc. Convert
to lb/cubic foot.
3. The United States has produced more than 380,000 metric tons
of Al per month. If the density of Al is 2.70 g / cc, how many
cubic meters is this?
(1 metric ton =1000 kg )
4. It is estimated that in the aurora borealis, excited hydrogen
atoms in the atmosphere may travel 2.0 x 103 km per second.
Convert to miles/hour
5. A 128 fluid-ounce carton of fruit juice contains an artificial
sweetener, calcium saccharin. The concentration is 7.5 mg
sweetener per fluid ounce.
A) Express this concentration in centigrams per milliliter.
B) How many grams of the sweetener are in the carton of
juice?
6. A certain city uses 3.000 x 104 kl of water per day. How many
metric tons of water are used in 1 year? Assume 365.0 days per
year. (1 metric tonne =1000 kg )