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The components of ordinary gunpowder are elemental sulfur, charcoal, and potassium nitrate. When gunpowder explodes, these components react as follows:

                   3S₈(s) + 16C(s) + 32KNO₃(s)

                   Sulfur     Carbon    Potassium nitrate

      16K₂O(s)    +    16CO₂(g)    +   16N₂(g)   +   24SO₂(g)

Potassium oxide   Carbon dioxide   Nitrogen     Sulfur dioxide

For this redox reaction, the reducing agents are __________ and __________.