2
The coefficient for oxygen is 1, and so is not written. The equation is already balanced.
1 nh3+ 2o2 >>>>> 1hno3 + 1h2o
2NaNO3 ==> 2NaNO2 + O2
4 Li + O2 = 2Li2O.
C(s) + O2(g) -> CO2(g)
4K + O2 = 2K2O so the "coefficient" is 1
The coefficient for oxygen is 1, and so is not written. The equation is already balanced.
9
1 nh3+ 2o2 >>>>> 1hno3 + 1h2o
4K + O2 --> 2K2O The coefficient of oxygen is 1 but, 1 is understood and never written as a coefficient.
The balanced equation for the complete combustion reaction is 2 C3H7OH + 9 O2 -> 6 CO2 + 4 H2O; therefore, the coefficient for oxygen is 9. If fractional coefficients are allowed, the equation can be written with only one mole of C3H7OH; in that instance the coefficient for oxygen would be 9/2.
2NaNO3 ==> 2NaNO2 + O2
Aluminium + Oxygen = Aluminium Oxide 2 Al + O2 = 2AlO2
4 Li + O2 = 2Li2O.
C(s) + O2(g) -> CO2(g)
A balanced chemical equation is when both the products and the reactants are balanced, or have the same number of atoms on each side of the equation. For example: 2H20 --> 2H2 + O2 This means there are 2 water molecules as the reactants (before reaction) and 4 hydrogen and 2 oxygen atoms as the products (after reaction). Technically the equation wouldn't work in real life if it weren't correctly balanced.
Because there are 2 oxygen atoms on the reactants side and only one on the products side. You can either add a coefficient of 1/2 on the O2 or you can add a coefficient of 2 on H2 and H2O.