How many moles of iron is equivalent to 4.05 x 1022 atoms of iron?

The problem described above is a simple conversion problem. To determine the number of moles of a substance given the number of particles of a substance, we use the Avogadro's number. It represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of ions, atoms or molecules into number of moles. We do as follows:

4.05 x 10^22 atoms of iron ( 1 mol iron / 6.022 x 10^23 atoms iron) = 0.0673 moles of iron

Therefore, 4.05 x 1022 atoms of iron is equal to 0.0673 moles of iron.

(b) Foreshadowing and flashback

Explanation:foreshadowing is  a giving a warning, an indication, or a hint of something that will happen in the future in a story. In the given passage from "The Black Cat" by Edgar Allan Poe, we can see an example of foreshadowing when the speaker says "In their consequences, these events have terrified have tortured have destroyed me" he hints the ending of the events that he is going to tell.