75.0 mL of a 1.50 M solution is diluted to a total volume of 278 mL. A 139-mL portion of that solution is diluted by adding 139 mL of water. What is the final concentration? Assume the volumes are additive.

Answer 1

1.50 M x (75.0 mL/278 mL) x [139 mL/(139+139)] = ?