Chlorine is found in combined state in :
Magnesium and chlorine atoms combine in the ratio of 1:2 to form one molecule of magnesium chloride.
An experiment showed that in a lead chloride solution, 6.21 g of lead combined with 4.26 g of chlorine.
What is the empirical formula of this chloride? [Pb = 207, Cl = 35.5]