Answer:
There are now two oxygen atoms on the left and four on the right (in one N2O and three H2O's), so we balance the oxygen atoms by placing a 2 in front of the O2.
The numbers before atoms are the coefficients, and they are used to balance chemical reacions. In the provided example, number in front of O₂ is 3.
Note: Since I do not have the proposed reaction, I provided a random example.
A balanced chemical reaction is an equation in which the number and type of atoms are the same on both sides of the arrows.
Following the law of mass conservation, chemical equations should be balanced to ensure that all the reactants appear in the products.
This means that no new atoms appear, and no atoms disappear. The only thing that changes in a chemical reaction is the bond between atoms.
So each side of the equation must be equilibrated concerning the amount and type of atoms.
Coefficients are used to balance reactions. These numbers are located before each atom and indicate the number of units present in the formula.
I do not have the proposed reaction, but I will provide an example using O₂.
Reactants ⇒ 4 Al and 3 O₂
3 O₂ = 6 O
Products ⇒ 2 Al₂O₃
2 Al₂ = 4 Al
2 O₃ = 6 O
On each side of the equation we have 4 Al and 6 O. The only thing that changes are the bonds between atoms.
In this case, the coefficient of O₂ is 3.
You can learn more about balanced chemical reactions at
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