14.5g of $NaCl$ is equal to 0.248 mol according to the equation
$n=m/M$
Now, this equates to $1.495 times 10^23$ Sodium chloride molecules.
We get this if we multiply 0.248 mol with Avogadro's number, $6.022 times 10^23$
Each molecule of Sodium chroride holds two atomic ions bonded in an ionic bond- $Na^+$ and $Cl^-$ in a 1:1 ratio. This means that the amount of molecules correspond with each of the individual ions.
So :
Number of Sodium ions=Number of Chloride ions= $1.495 times 10^23$ ions
So the total amount of ions is twice this number, $2.990 times 10^23$ ions in total.