Question

How many iron and chlorine atoms are there in an `18*mol` quantity of `FeCl_3`?

Answer 1

How many eggses in 18 dozen eggs? Are there not 216 individual eggs?

Explanation:

The mole is simply another collective number like a dozen, or a gross, or a score; just as there are `"12 items per dozen"`, there are `6.022xx10^23` `"items per mole"`. Chemists often use the abbreviation `N_A` to represent this number.

And so we gots an `"18 mole quantity"` of `FeCl_3`. Do you agree that CLEARLY there are `54*mol` of chloride ions, and `"18 mole"` of `Fe^(3+)` ions?

What is the mass of this molar quantity?

And why should we use such an absurdly large number like a mole? If the answer is not immediately apparent, then what is the MASS of `6.022xx10^23` `"individual hydrogen atoms?"` The mole is thus the link between the sub-micro world or atoms and molecules, to the macro world of grams and litres.....