The information in a balanced chemical equation that shows how many moles of reactant are involved in the reaction are the stoichiometric coefficients.

Here's how it works:

* Coefficients: These are the numbers written in front of each chemical formula in the equation.

* Moles: The coefficients represent the relative number of moles of each reactant and product involved in the reaction.

Example:

The balanced chemical equation for the combustion of methane is:

```

CH4 + 2O2 → CO2 + 2H2O

```

This equation tells us:

* 1 mole of methane (CH4) reacts with 2 moles of oxygen (O2).

* This produces 1 mole of carbon dioxide (CO2) and 2 moles of water (H2O).

Key takeaway: The stoichiometric coefficients in a balanced chemical equation provide the mole ratios between reactants and products, allowing us to determine the exact number of moles involved in the reaction.