convert all quantities
to mols !!
                 when working with quantities of matter
Second,
always use the units!!
First,
Just remember two things:
No
Problem!
When it comes to calculations, and problem solving…
Hey!
Why
the long
faces?
A gold atom may be considered to be a sphere with a radius of 162 pm. If the density of gold is 19.7 g/cm3, how many gold atoms will be found in 1 cubic inch ( 1 in3)?  The atomic wt    of gold is 197 g/mol.
        when working with quantities that have units