Considering the definition of chemical reaction, the correct answer is the first option: A coefficient shows how many molecules there are of a particular substance.
Chemical reaction is the way one substance reacts against another. That is, a chemical reaction occurs when the substances participating in it are transformed into different ones.
The chemical bonds between the atoms are broken and new bonds are formed. And there are two types of substances involved: those that are initially possessed are known as reactants and the substances that are obtained after the chemical reaction are called products.
A chemical equation is a way of expressing, using symbols and formulas, a chemical reaction. In it, the reactants are determined, the products are predicted and the proportions of the substances involved in the reaction are indicated.
Then, the stoichiometric coefficients indicate in what proportion the amounts of reactants and products of the reaction take part in the reaction.
Finally, the correct answer is the first option: A coefficient shows how many molecules there are of a particular substance.
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