concentration & moles

Question

a) What is the concentration of the new, 100.0 mL solution prepared by diluting 15.0 mL of 0.016 M CuCl₂?

b) How many moles of Cl^1- are there in 10.0 mL of 0.028 M CuCl₂ ? 

Answer 1

(15ml)(0.016 M) = (100 ml)(x M) and x = 0.0024 M (2 sig figs)

10 ml x 1 L/1000 ml x 0.028 mol/L x 2 mol Cl^-/mol CuCl₂ = answer