Grade 11 Chemistry: Concentration Calculation Problem?

Question

Problem

A 10.00g sample of CaCl2 is added to water to make 100.0ml of solution. Then a 400.0ml sample of water is added to this solution. Determine the concentration of Cl ions in the diluted solution.

Hey, I would appreciate it if someone would show me how to do this problem, thanks.

Answer 1

67.3*0.00130  be sure to represent the correct number of sigificant figures