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

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The answer is C. In order to balance this equation you have to look at the 2AlCl3. The first Cl2 needs to equal 6 because 2x3=6. So the answer is 3.

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