Question

(Question) How many atoms are in 3 grams of Cu?
(20 points)

Answer 1

Answer: 2.85 x 10^22

Step-by-step explanation:

We can use stoichiometry to convert grams to atoms.

*Important quantities*

Original amount of Copper: 3 grams

Molar mass of Copper: 63.5 grams

Avogadro's number: 6.022x10^23 atoms/formula units/molecules

Process -
`(3gramCu)/(1)`×
`(1 mole Cu)/(63.5 gCu)`×
`(6.022x10x^(23) )/(1 moleCu)` = 2.84503937×10^22

After taking sig figs into account, the answer needs to be rounded to 3 decimal places

Final answer: 2.85 x 10^22