The vapour density of chloride of an element is 39.5. The `Ew` of the elements is 3.82. The atomic weight of the elements is

Options

A. 15.28
B. 7.64
C. 3.82
D. 11.46

Answer

B

Explanation

`Mw = Ew xx x`
Valency of metal `= x`
Atomic weight of element `= Ew xx x`
`MCl_(x) = 3.82 xx x + x xx 35.5 = 79`
`x = (79)/(3.82 + 35.5) ~~ 2`
Atomic weight `= Ew xx x = 3.82 xx 2 = 7.64`