scientific notation

Question

An atom of gold has a mass of approximately 3.25×10−22 grams. What is the mass of 9000 atoms of gold? Express your answer in scientific notation.

Can you help me?

Answer 1

You can setup a proportion.

1 atom = 3.25 x 10^-22 g

9000 atoms = ? g

9000 atoms x (3.25 x 10^-22 g / 1 atom) = 2.93 x 10^-18 g