How many grams of NaOH are added to make 1 L of 1.0 M NaOH solution?

Molarity = no. of moles of solute / 1 liter . * one moles of sodium hydroxide = 40 gm of sodium hydroxide. so we can said ; if want prepare 1 molar NaOH solution then we need 40 gm NaOH dissolve in one liter of water so it became one 1 molar NaOH solution.

The density would be 1.622