CHEMISTRY 123

Question

What is the molarity of ZnCl2 that forms when 30.0 g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 260 mL .
Zn(s)+CuCl2(aq)→ZnCl2(aq)+Cu(s)

Answer 1

I'll guide you. You do the work.
From the balanced equation, which is given to you, note the mole ratio. That is 1 mole Zn produces 1 mole ZnCl2. Find moles Zn in 30.0 g of Zn (hopefully you know how to do this. If not divide 30 by 65.4 and go back and learn how). Then that will be the same number of moles of ZnCl2 formed (1:1 ratio). To find the MOLARITY, simply divide that number of moles by the volume in liters (0.260 liters).