Problem: When the following equation is balanced, the coefficient of sulfur dioxide is _______.  PbS (s) + O2 (g) → PbO (s) + SO2 (g) a. 5 b. 1 c. 3 d. 2 e. 4  

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When the following equation is balanced, the coefficient of sulfur dioxide is _______. 

PbS (s) + O2 (g) → PbO (s) + SO2 (g)

a. 5

b. 1

c. 3

d. 2

e. 4

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