Question

How many atoms are present in a piece of iron that has a mass of 65.0g(atomic mass; Fe-55.9amu)​

Answer 1

Answer:

You need to use two different relationships, grams to moles, and moles to atoms. Grams to moles can be figured out using the periodic table (Fe = 55.9 g/mol) and moles to atoms uses Avogadro’s number (6.02 x 10^23 atoms/mol of any substance).

Our blueprint:

Grams → moles → atoms

With the actual numbers:

65.0 g Fe * (1 mol Fe / 55.9 g Fe) * (6.02 * 10^23 atoms Fe / 1 mol Fe) =

(You can plug this into your calculator. You should get an answer close to 7 x 10^23 atoms)