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Study the following unbalanced redox reaction. Which one of the following choices represents the balanced redox equation?

PbS + O2→ PbO + SO2


PbS + 2O2→ PbO + 2SO2


2PbS + 2O2→ 2PbO + 2SO2


2PbS + 3O2→ 2PbO + 2SO2


3PbS + 3O2→ 2PbO + 2SO2

Verified Answer :

Edufirst

You only need to count the number of atoms of each element in both sides of the equation. To be balanced, the number of each kind of atom has to be equal in the two sides.

Only the fourth equation,  2PbS + 3O2→ 2PbO + 2SO2, complies that:

Element      Left side      Right side
Pb               2                  2
S                 2                  2
O                32=6           2 + 22 = 2 + 4 = 6


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