The chemical reaction of hydrogen with oxygen produces water. 2H₂(g) + O₂(g) → 2H₂O(g) c. How many moles of H₂O form when 2.5 moles of O₂ reacts?

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It allows us to calculate how much of each substance is involved based on balanced chemical equations. In this case, the stoichiometric coefficients in the reaction indicate that 2 moles of H₂ react with 1 mole of O₂ to produce 2 moles of H₂O.

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole corresponds to approximately 6.022 x 10²³ entities (atoms, molecules, etc.). Understanding the mole concept is essential for converting between mass, volume, and the number of particles, which is crucial for solving problems involving chemical reactions and stoichiometry.

A balanced chemical equation represents a chemical reaction with equal numbers of each type of atom on both sides of the equation. This balance ensures the law of conservation of mass is upheld. In the given reaction, the equation shows that 2 moles of H₂ and 1 mole of O₂ yield 2 moles of H₂O, which is vital for determining the amounts of reactants and products involved in the reaction.