How many grams are required to make 1 L of a 100 mg/L Cl- solution using NaCl salt?

Question

Calculations would be very helpful, Thank You

Answer 1

Molar mass of NaCl: 58.442 g/mol
Molar mass of Cl-: 35.453 g/mol
It is a simple ratio:
(NaCl needed)/100 = 58.442 /35.453
(NaCl needed) = 5844.2/35.453 =165 (mg)

Answer 2

Molar mass of NaCl is 58.442. Molar mass of CL is 35.453 so in one gram of sodium chloride, you'll find 0.3933 grams of sodium, and 0.6067 g of chlorine (35.453/58.442).
Then you need 100 mg (0.1 g) of Cl in your liter so add:

0.1g/0.6067 = 0.1648 g = 164.8261 mg of NaCl