Chemical equation is balanced according to the law of multiple proportions reciprocal proportions conservation of mass definite proportions.

Options

A. multiple proportions
B. reciprocal proportions
C. conservation of mass
D. definite proportions.

Answer

To determine which law a balanced chemical equation adheres to, we can analyze the options provided:

1. **Law of Multiple Proportions**: This law states that when two elements combine to form more than one compound, the ratios of the masses of the second element that combine with a fixed mass of the first element can be expressed in small whole numbers. This law is not directly related to balancing chemical equations.

2. **Law of Reciprocal Proportions**: This law states that if two different elements combine with a fixed mass of a third element, the ratios of the masses of the two elements are in the same ratio as the masses in which they combine with the third element. This law also does not directly apply to the balancing of chemical equations.

3. **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. This is the fundamental principle that governs the balancing of chemical equations. When we balance a chemical equation, we ensure that the number of atoms of each element is the same on both sides of the equation, thereby conserving mass.

4. **Law of Definite Proportions**: This law states that a chemical compound always contains its component elements in fixed ratio by mass. While this law is important for understanding the composition of compounds, it does not directly relate to the balancing of chemical equations.

**Conclusion**: The correct answer is the **Law of Conservation of Mass**. A balanced chemical equation is based on this law, as it ensures that the mass of the reactants equals the mass of the products.

### Step-by-Step Solution:

1. **Identify the Laws**: Review the four laws provided in the question.
- Hint: Familiarize yourself with the definitions of each law.

2. **Analyze Each Law**: Determine how each law relates to the concept of balancing chemical equations.
- Hint: Consider whether each law discusses mass, ratios, or proportions.

3. **Focus on Conservation of Mass**: Recognize that the law of conservation of mass is directly related to balancing equations.
- Hint: Recall that balancing involves ensuring equal numbers of atoms on both sides of the equation.

4. **Conclude**: State that the balanced chemical equation adheres to the law of conservation of mass.
- Hint: Remember that this law is fundamental to all chemical reactions.