In the equation,
2Al(s) + 3Cl2(g) —> 2AlCl3(s),
the large number "3" in front of Cl2 indicates the the number of moles of Chlorine molecules needed to balance the equation.
Hope this will help you.
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A only gets out some of it but not all
C that isn't for alcaholl
D I don't think that even exists
B is the only correct answer
