Answer:
The total number of atoms must be the same on both sides in order for it to be a balanced chemical equation.
In order to balance a chemical equation with the atoms on the right side of the equation with left side of the equation there must be:
b. total number of atoms
In a balanced reaction, the reactants go on the left side of the arrow, while the products go on the right side of the arrow. Coefficients (number in front of a chemical formula) indicate moles of a compound. Subscripts (numbers below an atom) indicate the number of atoms in a single molecule.
Thus, option b is correct.
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