## Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning

# Chapter 2 Atoms, Molecules, and Ions - Study Questions: 68

#### 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: $Al, Ga, As$

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