Chemistry Question on Stoichiometry and Stoichiometric Calculations

Question

Vapour density of a metal chloride is 47.5. If the valency of metal is 2, the metal is:

Answer 1

Solution

Molecular weight of metal chloride $=2\times V.\,d=2\times 47.5=95$ As the valency of metal is 2, hence, the molecular formula of its chloride will be $MC{{l}_{2}}$ . Hence, $MC{{l}_{2}}=95$ $M+2\times 35.5=95$ $M=95-71=24$ Hence, the metal must be magnesium (Mg) as its atomic weight is 24.