A 1.59-g sample of a metal chloride, #MCl_2#, is dissolved in water and treated with excess aqueous silver nitrate. The silver chloride that formed weighed 3.60 g. How do you calculate the molar mass of M?
We need a stoichiometric equation:
Given the stoichiometry of the precipitation reaction, there were
So we have a molar quantity, and a given mass, and the