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Compare the total mass of the reactants to the total mass of the products.
What choice demonstrates the Law of Conservation of Mass?

4 g H₂ + 61 g Cl₂ → 75 g HCl

12 g C + 22 g O₂ → 44 g CO₂

23 g Na + 12 g H₂O → 40 g NaOH + 1 g H₂

10 g H₂ + 46 g N₂ → 56 g NH₃

To demonstrate the **Law of Conservation of Mass**, the total mass of the reactants must equal the total mass of the products. Let's analyze each equation.

1. **4 g H₂ + 61 g Cl₂ → 75 g HCl**
   - Total mass of reactants: \( 4 \, \text{g} + 61 \, \text{g} = 65 \, \text{g} \)
   - Total mass of products: \( 75 \, \text{g} \)
   - **Not conserved**, because \( 65 \, \text{g} \neq 75 \, \text{g} \).

2. **12 g C + 22 g O₂ → 44 g CO₂**
   - Total mass of reactants: \( 12 \, \text{g} + 22 \, \text{g} = 34 \, \text{g} \)
   - Total mass of products: \( 44 \, \text{g} \)
   - **Not conserved**, because \( 34 \, \text{g} \neq 44 \, \text{g} \).

3. **23 g Na + 12 g H₂O → 40 g NaOH + 1 g H₂**
   - Total mass of reactants: \( 23 \, \text{g} + 12 \, \text{g} = 35 \, \text{g} \)
   - Total mass of products: \( 40 \, \text{g} + 1 \, \text{g} = 41 \, \text{g} \)
   - **Not conserved**, because \( 35 \, \text{g} \neq 41 \, \text{g} \).

4. **10 g H₂ + 46 g N₂ → 56 g NH₃**
   - Total mass of reactants: \( 10 \, \text{g} + 46 \, \text{g} = 56 \, \text{g} \)
   - Total mass of products: \( 56 \, \text{g} \)
   - **Conserved**, because \( 56 \, \text{g} = 56 \, \text{g} \).

Thus, the reaction **10 g H₂ + 46 g N₂ → 56 g NH₃** demonstrates the **Law of Conservation of Mass**.

Would you like more details or have any questions?

Here are some related questions:
1. How can the Law of Conservation of Mass be violated in a chemical reaction?
2. What are some common types of reactions where mass appears to change?
3. How does the Law of Conservation of Mass apply in open systems?
4. How do scientists measure mass changes in real-life chemical reactions?
5. How does the Law of Conservation of Mass relate to energy conservation in reactions?

**Tip:** When calculating mass, always ensure all reactants and products are accounted for, including gases.

Compare the total mass of the reactants to the total mass of the products. What choice demonstrates the Law of Conservation of Mass?

4 g H₂ + 61 g Cl₂ → 75 g HCl
12 g C + 22 g O₂ → 44 g CO₂
23 g Na + 12 g H₂O → 40 g NaOH + 1 g H₂
10 g H₂ + 46 g N₂ → 56 g NH₃

Learn how to apply the Law of Conservation of Mass by comparing the total mass of reactants and products in chemical reactions. This example uses various reactions, showing that only the equation 10 g H₂ + 46 g N₂ → 56 g NH₃ follows this law. Suitable for Grades 8-10.

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