{V1} mL of 0.100 M HCl is placed in a {V2}.0 mL volumetric flask and water is added to bring the final volume up to 250.0 mL. What is the molarity of the dilute solution?
It was 0.1 in the V1 (whatever volume that is) and you diluted it to 250 sothe new concn is
It's 0.1 x (V1/250) = ?
I don't know why you wrote it was placed in a V2.0 volumetric flask. If it were brought to 250.0 mL I would assume it was placed in a 250 mL flask.