About 6 × 109 g of gold is thought to be dissolved in the oceans of the world. if the total volume of the oceans is 1.5 × 1021 l, what is the average molar concentration of gold in seawater?

First, determine the number of moles of gold.

Number of moles  =

Given mass of gold  =

Molar mass of gold  = 196.97 g/mol

Put the values,

Number of moles of gold  =

= or

Now, molarity  =

Put the values, volume of ocean  =

Molarity =

=

Thus, average molar concentration =

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

the answer is c. nacl