The percentage of hydrogen in water and hydrogen peroxide is 11 .1 and 5.9 respectively . These figures illustrate

Options

A. Law of multiple proportions
B. Law of conservation of mass
C. Law of constant proportions
D. Law of combining volumes

Answer

To solve the question regarding the percentage of hydrogen in water (H2O) and hydrogen peroxide (H2O2), we need to analyze the given data and relate it to the laws of chemistry.

### Step-by-step Solution:

1. **Identify the Compounds and Their Percentages**:
- Water (H2O) has a percentage of hydrogen = 11.1%
- Hydrogen Peroxide (H2O2) has a percentage of hydrogen = 5.9%

2. **Calculate the Ratio of Hydrogen Percentages**:
- The ratio of the percentage of hydrogen in water to that in hydrogen peroxide can be calculated as follows:
\[ \text{Ratio} = \frac{\text{Percentage of H in H2O}}{\text{Percentage of H in H2O2}} = \frac{11.1}{5.9} \]
- This simplifies to approximately 1.88, which can be approximated to a ratio of about 2:1.

3. **Understanding the Law of Multiple Proportions**:
- According to the law of multiple proportions, when two elements combine to form more than one compound, the ratios of the masses of one element that combine with a fixed mass of the other element can be expressed in small whole numbers.
- In this case, hydrogen is present in two different compounds (H2O and H2O2) in different proportions, which illustrates the law of multiple proportions.

4. **Evaluate Other Options**:
- **Law of Conservation of Mass**: This law states that mass is neither created nor destroyed in a chemical reaction. This is not applicable here as we are not discussing a reaction.
- **Law of Constant Proportions**: This law states that a chemical compound always contains its component elements in fixed ratio by mass. This does not apply here as we are comparing two different compounds.
- **Law of Combining Volumes**: This law pertains to gases and their volumes in reactions, which is not relevant in this context.

5. **Conclusion**:
- The correct conclusion is that the percentages of hydrogen in water and hydrogen peroxide illustrate the **law of multiple proportions**.

### Final Answer:
The figures illustrate the **law of multiple proportions**.