Question

the equivalent weight of a divalent metal whose chloride has vapour density equal to 60 is

Answer 1

we know,
molecular weight of any compound = 2 × vapor density of that compound
so, molecular weight of metal chloride = 2 × 60 = 120

Let chemical formula of metal chloride is MCl2
{because metal is divalent so, chlorine must be multiplied by 2}
now, molecular weight of MCl2 = atomic weight of M + 2 × atomic weight of Cl
120 = atomic weight of M + 2 × 35.5
atomic weight of M = 120 - 71 = 49

now equivalent weight of M = molecular weight/valency
= 49/2 = 24.5