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Problem 54

In the process of balancing the equation
$$\mathrm{Al}+\mathrm{Cl}_{2} \longrightarrow \mathrm{AlCl}_{3}$$
Student I writes: Al $+\mathrm{Cl}_{2} \longrightarrow \mathrm{AlCl}_{2}$
Student II writes: $\mathrm{Al}+\mathrm{Cl}_{2}+\mathrm{Cl} \longrightarrow 2 \mathrm{AlCl}_{3}$
Student III writes: $2 \mathrm{Al}+3 \mathrm{Cl}_{2} \longrightarrow 2 \mathrm{AlCl}_{3}$
Is the approach of Student I valid? Student II? Student III?
Explain.

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Chapter 3
Stoichiometry of Formulas and Equations
CHEMISTRY: The Molecular Nature of Matter and Change 2016

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