Hello everyone, today we will be discussing a fundamental concept in chemistry known as the Law of Conservation of Mass. This law states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products. To illustrate this, let's consider the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O). The equation for this reaction is: 2H2 + O2 → 2H2O According to the Law of Conservation of Mass, the total mass of hydrogen and oxygen atoms in the reactants must equal the total mass of hydrogen and oxygen atoms in the products. This means the total mass of the hydrogen and oxygen atoms in the reactants (2x2g + 32g) must equal the total mass of the hydrogen and oxygen atoms in the products (2x18g). By balancing the equation, we can see that the total mass of the reactants (4g + 32g) is equal to the total mass of the products (36g), thus confirming the Law of Conservation of Mass. In conclusion, the Law of Conservation of Mass is a critical principle in chemistry that ensures that mass is neither created nor destroyed in a chemical reaction. It is a foundational concept that underpins our understanding of the physical world. Thank you for watching this micro-lesson.