How many grams of sodium chloride are required to make a 1.0 L solution with a concentration of 3.5 M?

The molecular weight of NaCl is 58.44; sodium =22.99; Chlorine=35.45.

A 1 molar solution is the molecular weight in grams in 1 litre of water, so a 3.5 molar solution would be 58.44g multiplied by 3.5, which is 204.54g in 1L.