You have a standard solution of 1.677 M lead. You quantitatively dilute 5.00 ml of this solution into a 100 ml volumetric flask. AES analysis of this dilute solution finds a voltage of 102.3 mV. You then take an unknown solution of lead, and dilute 5.00 ml to 50 ml in a volumetric flask, and record a signal of 321.2 mV.
What is the concentration of lead in this unknown?