How many atoms are there in 0.45 mol of aluminium?
To determine the number of atoms in 0.45 mol of Al, let's use the following conversion factor:
Since we're given moles, let's use the first conversion. This will allow the unit, mole, to be cancelled out. Then, you will be left with the units that you want (atoms)!
Set the problem up like this:
Multiply straight across to obtain a value of: