posted by Kat on .
what is the total # of grams of NaOH(formula mass=40) needed to make 1.0 liter of a 0.20 M solution
Go back to the molarity definition.
is the answer b
molarity = #mols/L
0.20 M means we want # mols in 1 L to be 0.20 mols. grams = mols x molar mass = 0.2 x 40 = ??
0.20 x 40 = 8.0g