The answer to this question is Option 3- Na2O
Energy in a chemical reaction is not created nor destroyed, it's always conserved based on the law of conservation of energy.
You have to balance out those forces and apply the same amount of equal and opposite force to it. I hope I helped ^^
Answer:
12
my advice is split the equation into 2 and write on each side how many atoms of each element are there and it will be easier to balance.