In 100 mL of distilled water,1.0g of thallium cholirde is added. How much of the 1.0g of TlCl doen't dissolve. The Ksp of TlCl is 3.6 x 10-6.
mols TlCl = grams/molar mass = ? mols
Then M = mols/L = approx 0.04 but you need to do it more accurately.
........TlCl ==> T.^+ + Cl^-
I.......solid....0.......0
C.......solid....x........x
E.......solid....x........x
Substitute the E line into the Ksp expression and solve for x. That gives you the molar solubility of TlCl.
Convert to grams and subtract from 1.0g initially to find the amount that does not dissolve.