To determine which equation demonstrates the Law of Conservation of Mass, we need to look for an equation where the total mass of the reactants equals the total mass of the products.
For example, consider the reaction:
\[ \text{A} + \text{B} \rightarrow \text{C} + \text{D} \]
If we can assign specific masses to A and B (the reactants) and show that their total mass equals the total mass of C and D (the products), then this equation would demonstrate the Law of Conservation of Mass.
If you provide specific equations, I can help identify which one (if any) illustrates the Law of Conservation of Mass.