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

1 Answer
Dec 10, 2017

Answer:

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.....