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Mathematics 20 Online
OpenStudy (anonymous):

The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation? 2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2 A. The equation is balanced as is. B. A 3 is required. C. A 2 is required. D. A 6 is required.

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