Question

$27$ g of aluminium combines with hydrogen forming $30$ g of hydride. The equivalent weight of aluminium (in g) is:

Answer 1

Mass of aluminium $=27$ g.
Mass of hydride $=30$ g.
Hence, hydrogen combined $=3$ g.
$3$ g hydrogen combines with $27$ g of Al.
$1$ g hydrogen combines with $9$ g of Al.
$\therefore$ Equivalent weight if aluminium $=9$ g (by the definition of equivalent weight which states that it is equal to the mass combining with 1 g atoms of hydrogen).