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Sum of coefficients

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Tom:
Can anyone tell me what the balance the following chemical equation using the minimum integral coefficients would be? The sum of the coefficients is CaSO3 + HBr ? CaBr2 + SO2 + H2O.
 
   a.   5
   b.   6
   c.   7
   d.   8

integral0:
ok

my teacher always told me to balance Hydrogen and Oxygen last

so here it goes

CaSO3 + 2HBr -> CaBr2 + SO2 + H20

answer is b.

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