In the equation, 2Al (s) + 3Cl2 (g) → 2AlCl3 (s), the large number "3" in front of the Cl2 indicates:
the number of chlorine atoms needed to balance the equation
the number of chloride molecules needed to balance the equation
the number of moles of chlorine atoms needed to balance the equation
the number of moles of chlorine molecules needed to balance the equation
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