Problem- Earth's oceans have an average depth of 3800 m, a total area of 3.63*10^8 km^2, and an average concentration of dissolved gold of 5.8*10^?9 g/L. if a recent price of gold was $ 319.00/troy oz, what is the value of gold in the oceans? (1 troy oz=31.1 g) enter your answer in scientific notation.
I just need a general explanation of it please- Thanks!