Question

Nitric acid, HNO3, is available commercially at a concentration of 16 M.

What volume would you use to prepare 770 mL of a 0.19 M solution?

Answer 1

0.77*0.19M = X*16M
Solve for X in litres.

Answer 2

Mathmate's answer is quite good (and correct); I just want to point out that one need not convert from mL to L to solve the problem. One can use
mL x M = mL x M so
770*0.19=X*16
Solve for X and the answer is in mL.

Answer 3

Thank you Dr. Bob.
The answer will then be automatically in the unit given in the question.