Question

How many moles are in 100 grams of NaCl

Answer 1

There is 1.71 moles in 100 grams of NaCl. You find this by taking the molar mass of Na which is 22.99, and Cl which is 35.45, and you add them together, then divide by 100. Hope this helps.

Answer 2

If you check the Periodic table, to Molar Mass of Sodium Chloride NaCl is 58.3 g/mol. 
So, you divide 1 mol over the Molar mass of NaCl which 58.3, and the answer you divide it by 100. 
So you get:
$\frac{1 mol}{58.3} * 100$
You do the Calculations and you get about 1.72 mol of NaCl

Hope this Helps :)