An atom of gold has a mass of approximately 3.25×10−22

grams. What is the mass of 4000
atoms of gold? Express your answer in scientific notation.

1 answer

To find the mass of 4000 atoms of gold, we need to multiply the mass of one atom by 4000.

Mass of 4000 atoms of gold = (3.25 * 10^-22 grams) * 4000

Multiplying these numbers gives:

Mass of 4000 atoms of gold = 13 * 10^-22 grams

However, we can simplify this by moving the decimal point one place to the right and changing the exponent:

Mass of 4000 atoms of gold = 1.3 * 10^-21 grams

Therefore, the mass of 4000 atoms of gold is 1.3 × 10^-21 grams.