Question

how many atoms are contained in 9.0 moles of iron

Answer 1

Solution:

First, use Avogadro's number (6.022·10^23) to solve for the atoms of iron. In fact, one mole of any substance contains 6.022·10^23 particles of that substance. Since iron is not diatomic one mole of iron contains 6.022×·10^23 atoms Fe. So, 9.0 moles of iron contains 9*6.022·10^23=5.42·10^24 atoms.

Answer: 5.42·10^24