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.
ANSWER 19,000 g/m3
2. The average density of the total earth is 5.52 g/cc. Convert
to lb/cubic foot.
ANSWER 345 lb/ft3
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 )
ANSWER 140,000 m3/month
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
ANSWER 4,500,000 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.
ANSWER 0.025 cg/mL
B) How many grams of the sweetener are in the carton of
ANSWER 0.95 g
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 )
ANSWER 10,950,000 tn/year
7. Your bedroom measures 5.00m by 6.00m by 2.50m. You are
interested in filling it completely with sand which has a density
of 16.0 lb/gal.
A) What is the volume of the room in cubic yards?
ANSWER 98.1 cubic yards
B) How many kg of sand will you need to buy to fill the room to
the top?
ANSWER 1.44 x 105 kg
8. The area of a field is 5.00 x 1010 m2.
field in square miles?
What is the area of the
ANSWER 1.93 x 104 square miles