Assertion: Stoichiometry is used to calculate the quantitative relationships between reactants and products. Reason: A balanced chemical equation gives the mole ratio between reactants and products.

📘 Assertion–Reason Analysis

🔵 Assertion

Stoichiometry is used to calculate the quantitative relationships between reactants and products.

This statement is TRUE. Stoichiometry deals with the calculation of the amounts of reactants required and products formed during a chemical reaction.

Reactants → Products

It can be used to calculate quantities such as moles, mass and number of particles.

🟠 Reason

A balanced chemical equation gives the mole ratio between reactants and products.

This statement is also TRUE. The coefficients in a balanced chemical equation represent the relative number of moles of the reacting species.

🧮 Example of Mole Ratio

2H₂ + O₂ → 2H₂O

From the coefficients:

H₂ : O₂ : H₂O

2 : 1 : 2

Therefore:

2 mol H₂ + 1 mol O₂ → 2 mol H₂O

🎬 Stoichiometric Mole-Ratio Animation

H₂ H₂ + O₂ → H₂O H₂O

2 mol H₂ : 1 mol O₂ : 2 mol H₂O

The coefficients establish the mole ratio used in stoichiometric calculations.

🔗 How Stoichiometry Uses the Mole Ratio

Balanced Equation → Mole Ratio → Calculate Unknown Quantity

For example, if 4 mol H₂ react completely:

2 mol H₂ → 2 mol H₂O

4 mol H₂ → 4 mol H₂O

🔗 Relationship Between Assertion & Reason

The balanced equation provides the mole ratio, and this mole ratio is the basis for quantitative stoichiometric calculations.

Balanced Equation → Mole Ratio → Stoichiometry → Quantitative Relationship

✅ Final Answer

Both Assertion and Reason are TRUE, and Reason is the correct explanation of Assertion.

🎯 Key Concept

Balanced Equation = Mole Ratio

Mole Ratio = Basis of Stoichiometric Calculations