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The equation for the chemical reaction shown below is not balanced. What number should replace the question mark to balance this equation? 2Al + ?Cl2 → 2AlCl3 A. the number 2 B. the number 3 C. the number
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The equation for the chemical reaction shown below is not balanced. What number should replace the question mark to balance this equation? 2Al + ?Cl2 → 2AlCl3 A. the number 2 B. the number 3 C. the number 4 D. the number 5

User Hari Honor
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B. the number 3.
there are 2Al's on both sides and 6 Cl's on the right side so to balance it, you multiply Cl2 by 3 to get 6 Cl's.
User Joel Berger
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