Question

What is the number that describes how many molecules of a substance are involved in a chemical reaction?

Answer 1

The Coefficient

Step-by-step explanation:

What is a coefficient?

Generally, a coefficient is any number attached to a variable. It describes how many the variable is. It is usually on the left side of the variable. An example is 2abc, where 2 is the coefficient of the variable, abc. It shows that the variable, abc is 2 or double.

The same thing applies to chemical substances. Here, the coefficient shows the many molecules involved in a chemical reaction. For instance, we have:
`2H _(2)O`, where 2 is the coefficient of the substance,
`H _(2)O`. It shows that there are 2 water molecules in a chemical reaction.

I hope this helped.