Question

A sample of crushed rock is found to have 4.81 x1021 atoms of gold, how many moles of gold are present in this sample?


7.99 x 10^-3 moles


1.57 x10^-1 moles


1.25 x 10^3 moles


2.47 x10^5 moles

Answer 1

Answer:

7.99 x 10^-3 moles

Explanation:

Use the Avogadro constant of 6.02 x 10^23

Number of moles of gold

= (4.81 x 10^21) ÷ (6.02 x 10^23)

= 7.99 x 10^-3 moles