Concentrated hydrochloric acid has a molarity of 6.0 m. how many ml of hci must be used to make 500.0 ml of 2.0 m hydrochloric acid?

The answer to your question is:  167 ml

Explanation:

Data

HCl = 6 M

Volume 1 = ?

HCl 2 = 2 M

Volume 2 = 500 ml

Formula

                 C1 V1 = C2 V2

                V1 = C2V2 / C1

Process

                V1 = (2 x 500) / 6

                V1 = 1000 / 6

                V1 = 166.7 ml ≈ 167 ml

that's what i got you can count the number of atoms