Question

How many total moles of ions are released when the following sample dissolves completely in water?

5.93 × 1018 formula units of LiCl = ______ × 10 _______ mol

Answer 1

number of formula unit = 5.93*10^18

number of mol of LiCl = 5.93*10^18 / (6.022*10^23)

= 9.85*10^-6 mol

LiCl dissolves as:

LiCl —> Li+   +   Cl-

so, 1 mol formula unit gives 2 mol of ions

So,

mol of ions = 2*9.85*10^-6 mol

= 1.97*10^-5 mol

Answer: 1.97*10^-5 mol