calculate the final concentration if 4.0 L of 1.5 M NaC1 and 2.0 L of 3.0 M NaC1 are mixed.

Answer 1

Find moles NaCl from 1.5 M and moles NaCl from 3.0 M, add them together and divide by the total volume in liters. Post your work if you get stuck.

Answer 2

Moles of salt present: 4*1.5+2*3=12 moles salt.
Volume= 6liters

Molarity=moles/volume