Question: how many moles are in 100 grams of nacl?
Answer: From the Periodic Table you can see that Na is 22.99 g/mole and Cl is 35.45 g/mole. This makes NaCl 22.99 + 35.45 = 58.44 g/mole, and 100g of NaCl about 100/58.44 ~ 1.711 moles.