Question

There are ____ atoms in 80 g of copper.
Help

Answer 1

For this question you need two steps.

First find the moles, \(\sf moles=\dfrac{mass}{Molar~mass}\)

then multiply by avogadro's number,

\(\sf \#~atoms=moles*avogadro's~number \)

Answer 2

The Avogadro number is 6.022x10^23

Answer 3

Right

Answer 4

yes

Answer 5

First convert the 80 grams of copper into moles of copper by multiplying by ( 1 mole / 63.55 g). Then use Avogadra's number = 6.022 X 10 ^23 to convert from moles Cu to atoms Cu. So basically:
(80 g Cu) x (1 mol Cu / 63.55 g Cu) x (6.022 x 10 ^23 atoms / 1 mol Cu).
The first answer is 7.58 x 10 ^ 23 atoms Copper.