Earth's oceans have an average depth of 3800 m, a total area of #3.63 x 10^8 km^2#, and an average concentration of dissolved gold of #5.8 x 10^-9# #g#/#L#. How many grams of gold are in the oceans?

1 Answer
Sep 5, 2016

Answer:

Over 8 million kilograms; i.e. #8xx10^9*g#

Explanation:

We need to find the volume of the ocean in #m^3#, and then multiply this volume by the average concentration in #g*L^-1# knowing that there are #1000 *L# in a #m^3#.

#"Volume of the oceans"# #=# #3.63xx10^11*m^2xx3800*m# #=# #1.38xx10^15*m^3#.

#"Mass of gold"# #=# #"Volume "xx" concentration"#

#=# #1.38xx10^15*cancel(m^3)xx5.8xx10^-9*g*cancel(L^-1)xx1000*cancelL*cancel(m^-3)#

#=# #8004000000# #g#

#=# #8004000*kg#

Anyway, go over my figures carefully. There is a lot of arithmetic here.