Answer the following question given this paragraph: 

In chemical equations, reactants and products are represented by chemical symbols and formulas. Numbers called coefficients are placed in front of the symbols and formulas to show how much of each substance is involved in the reaction.


Q: What does the coefficient in front of an element in a formula indicate?

 Choices:

- number of atoms

- place on the Periodic Table

- time of the reaction

- how much is involved in the reaction

A:
how much is involved in the reaction
