An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is? (H = 1)

An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?

(H = 1)

Answer Details

Molecular Mass = Vapour density x 2 = 17.0 x 2 = 34.0
∴ Relative Atomic Mass of X in XH3 = 34 - 3
= 31.0 ∴ x = 31.0