Quick question regarding solution concentrations

[JyN]

If you had a compound, say NaCl, with a certain concentration in water. Would the concentration, in mols/volume, be the same for Na as for NaCl?

if the concentration for NaCl was .1M, the concentration of Na would be .1M as well?

And if you somehow had Na2Cl with a .1M concentration, would the concentration of Na be twice that of Na2Cl?

 

[chemisttree]

Review the difference between normality and molarity.