how many mL of 150 M NaOH is needed to make 1000 mL of 300 M

how many mL of 15.0 M NaOH is needed to make 100.0 mL of 3.00 M NaOH?

Number of moles of NaOH = molarity * volume of solution in L

Number of moles of NaOH = 3.00 * 0.100 = 0.3 mole

molarity = number of moles / volume of solution in L

15.0 = 0.30 / volume of solution in L

volume of solution in L = 0.30 / 15.0 = 0.02 L

1 L = 1000 mL

0.02 L = 20.0 mL

Therefore, the volume of solution = 20.0 mL