Calculate the amount (in g) of NaOH required to prepare 150 mL of 3 M NaOH solution

Answer 1

molar mass NaOH = 40 g/mole

150 ml x 1 L/1000 ml = 0.150 L

3 M = 3 moles/L

Calculate moles NaOH in 0.150 L of 3 M:

0.150 L x 3 moles/L = 0.45 moles NaOH

Convert 0.45 moles NaOH to grams:

0.45 moles NaOH x 40 g/mole = 18 grams (since 3 M has only 1 sig. fig., the answer would be 20 g)