Answer
24.59 mL
Work Step by Step
You have a 6.1M solution of HCl, which is 6.1 mol/L. To find how many mL you need to get 0.150 mol you divide the moles by the concentration as follows:
0.150 mol * (1L/6.1 mol) = 0.02459L
Then multiply this by 1000 to get the mL
24.59 mL