The oxidation-reduction reactions
2C₃H₆(g) + 9O₂(g) → 6CO₂(g) + 6H₂O(g)
Fe₂O₃(s) + 3CO(g) → 2Fe(l) + 3CO₂(g)
Further explanation
Given
Reaction
Required
Oxidation-reduction reactions
Solution
In a redox reaction there will be a change in oxidation number
Oxidation: there is an increase in oxidation number
Reduction: there is a decrease in the oxidation number
1. 2C₃H₆(g) + 9O₂(g) → 6CO₂(g) + 6H₂O(g)
C in C₃H₆ = 3.C+6.+1=0⇒3C=-6⇒C=-2
C in CO₂ = C+2.(-2)=0⇒C=4
-2 to +4 ⇒ oxidation
O in O₂ = 0
O in H₂O = 2.+1+O=0⇒O=-2
0 to -2 ⇒reduction
2. Fe₂O₃(s) + 3CO(g) → 2Fe(l) + 3CO₂(g)
Fe in Fe₂O₃(s) = +2
Fe in Fe(l) = 0
+2 to 0 ⇒ reduction
C in CO = +2
C in CO₂ = +4
+2 to +4 ⇒ oxidation
