How many iron ions are found in 10.9 molecules

= 6.56 * 10²⁴ ions

Explanation:

We are given;

10.9 moles of Iron (iron doesn't exists as a molecules, so we can't have 10.9 molecules but we can have 10.9 moles)

We are required to determine the number of ions

We need to know that;

1 mole of iron = 6.022 * 10²³ ions

Therefore;

10.9 moles of iron will contain;

= 10.9 moles * 6.022 * 10²³ ions/mol

= 6.56 * 10²⁴ ions

Hence, 10.9 moles of iron contains 6.56 * 10²⁴ ions