Chem 132: When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type?

Question:

When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type?
MnO2 + HCl → MnCl2 + Cl2 + H2O

Select one:
a. 3
b. 4
c. 1
d. 2
e. 5

Answer

b. 4

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