Final answer:
To find the number of iron atoms in the head of the pin, we can use Avogadro's number and the number of moles of iron. There are approximately 4.816 x 10^21 iron atoms in the head of the pin.
Step-by-step explanation:
To find the number of iron atoms in the head of the pin, we need to convert the number of moles of iron to the number of atoms. One mole of a substance contains Avogadro's number (6.02 x 10^23) of particles, which include atoms. So, the number of iron atoms in the head of the pin can be calculated as:
Number of atoms = Number of moles x Avogadro's number
Given that there are 8 x 10^-3 moles of iron in the head of the pin, we can calculate:
Number of atoms = 8 x 10^-3 mol x 6.02 x 10^23 atoms/mol = 4.816 x 10^21 atoms