Answer
$Al, Ga, As$
Work Step by Step
Atomic weights: $Ga: 69.723 u,\ Al: 26.982 u,\ As: 74.922 u$
In the sample:
Ga: $52\ g \div 69.723 \ g/mol = 0.75\ mol$
Al: $9.5\ g \div 26.982 \ g/mol = 0.35\ mol$
As: $112\ g \div 74.922 \ g/mol = 1.49\ mol$
So from smallest to largest amount of moles:
$Al, Ga, As$
