How many moles are in #2.1 * 10^23# formula units of #NaCl#?

1 Answer
Feb 27, 2016

Answer:

This many #NaCl# units approximately represents #1/3# mole of #NaCl#.

Explanation:

If I have #6.022xx10^23# individual items of stuff (any stuff), I have #1# #mol# of stuff by definition. Here, I have #2.1xx10^23# formula units of #NaCl#: i.e.

#(2.1xx10^23" formula units of NaCl")/(6.022xx10^23" formula units of NaCl "mol^-1)# #=# #??# #"moles"#

How many individual #Na^+# and #Cl^-# ions does this represent?