An element X forms a volatile hydride XH3 with ... - JAMB Chemistry 1997 Question
An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?
(H = 1)
A
34.0
B
31.0
C
20.0
D
14.0
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Correct Option: B
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
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