Chemistry Question! I'm Lost?

Question

Calculate the final volume in mL of a solution obtained if 100.0 mL of 6.27 M NaCl is diluted to 1.81 M.

Answer 1

Let the final volume to be X mL. Since the molar mass of NaCl in the solution is never changed, we have:
100.0 mL * 6.27 M = X mL * 1.81 M
Solve for X.