Chemistry hw help

Question

Sea water contains 8.0 x 10-2 cg of the element strontium per kilogram of sea water. Assuming that all the strontium could be recovered, how many grams of strontium could be obtained from one cubic meter of sea water? Assume the density of sea water is 1.05 g / mL.

Answer 1

NOTE: This answer presumes that "8.0 x 10-2 cg" from the original question did actually mean centigrams which is an unusual measurement.

 

A cubic meter of sea water is equivalent to 1,000,000 mL (100 cm X 100 cm X 100 cm). Multiplied by the given density of sea water, this equates to 1.0X10^6 mL X 1.05 g/mL = 1.05x10^6 grams = 1.05x10^3 kilograms. You would then multiply this weight by the strontium content of 8.0x10^-2 centigrams/kilogram giving you 84 centigrams of strontium or 0.84 grams in one cubic meter of sea water.