Question

How many copper atoms are in a pure copper statue with a mass of 177 kg?

Answer 1

Answer:
`1.677*10^(27)` copper atoms

Step-by-step explanation:

Lets first do unit conversions:

177 kg = 177000 grams (there are 1000 g in a kg)

Looking up on the periodic table, we can see that copper has a molar mass of 63.55 amu (atomic mass units).

Doing
`(177000)/(63.55)`, we get that there 2785.2085 moles of copper in the statue.

Knowing that Avagadro's number (
`N_(A)`) is
`6.02214*10^(23)`, we can find that there are 2785.2085*6.02214*10^(23) or
`1.677*10^(27)` copper atoms in the statue.

Thus
`1.677*10^(27)` is the answer