8 g of oxygen combine with 1 g of hydrogen and 29 g of calcium therefore, when calcium combines with hydrogen it must combine in the ratio of 20:1. This statement conforms to the law of

Options

A. multiple proportions
B. reciprocal proportions
C. definite proportions
D. gaseous volume

Answer

To solve the question, we need to identify which law of chemical combination is being confirmed by the statement regarding the ratio in which calcium combines with hydrogen.

### Step-by-Step Solution:

1. **Understanding the Given Data**:
- The problem states that 8 g of oxygen combines with 1 g of hydrogen and 29 g of calcium.
- It also mentions that when calcium combines with hydrogen, it does so in a ratio of 20:1.

2. **Identifying the Ratios**:
- The ratio of calcium to hydrogen is given as 20:1. This indicates that for every 20 grams of calcium, there is 1 gram of hydrogen.

3. **Applying the Law of Definite Proportion**:
- The law of definite proportion states that a chemical compound always contains its component elements in fixed ratio by mass.
- In this case, the ratio of calcium to hydrogen is fixed at 20:1, which means that no matter how much calcium or hydrogen is used, the ratio will always remain the same.

4. **Conclusion**:
- Since the combination of calcium and hydrogen occurs in a fixed ratio (20:1), this confirms the law of definite proportion.

5. **Final Answer**:
- Therefore, the statement conforms to the **Law of Definite Proportion**.