The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. The atomic weight of the metal is

Chemistry
,
#1

The equivalent weight of a metal is 4.5 and the molecular weight of its chloride is 80. The atomic weight of the metal is :

a) 18
b) 9
c) 4.5
d) 36

#2

The correct answer is b) 9.

Solution :

Molecular weight of MClx
80 = x(4.5 + 35.5)
80 = 40x
x = 2
Atomic weight = Equivalent weight * Valency = 4.5 * 2 = 9.