Answer: 
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The equation can be written in terms of ions as:

Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form.
The ions which are present on both the sides of the equation are potassium and nitrate ions and hence are not involved in net ionic equation.
Hence, the net ionic equation is :

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Answer:
synthesis
it's the reaction of bringing two atoms into one
Na + Cl --> Nacl
or more generally
A + B --> AB
4Fe + 3O2 -> 2Fe2O3
triple it to get 6 Moles of Fe2O3
12Fe + 9O2 -> 6Fe2O3
so 9 moles of diatomic oxygen are required
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