73.79g of a compound MCl2 contains 28.54g of chlorine. Determine the molar mass mystery element M.
.......MCl2 ==> M + Cl2
.....73.79g..45.25..28.54
mols Cl2 = 28.54/molar mass = approx 0.4 but you may need to do it more accurately.
Since 1 mol Cl2 is given off for 1 mol MCl2 and 1 mol M, then 45.25 g M must be approx 0.4 mol.
mol = grams/atomic mass.
0.4 45.25/atomic mass
Solve for atomic mass = about 112 or so. Do this more accurately and look up the element in the periodic table. Is that somewhere around Cd?