The correct coefficient of oxygen is 5.
The question is incomplete, the complete question is;
Examine the chemical reaction C3H8 + O2----> 4H2O + 3CO2. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation?
A: 3
B: 5
C: 7
D: 10
The principle of balancing chemical reaction equation is that the number of atoms of each element at the right hand side of the reaction equation must be equal to the number of atoms of the same element at the left hand side of the reaction equation.
Given the reaction; C3H8 + O2----> 4H2O + 3CO2, it will only become balanced when the coefficient of O2 is 5.
Hence, we can write; C3H8 + 5O2----> 4H2O + 3CO2
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