The `CO_(2)` content by volume, in the atmospheric air is about

Options

A. `3.34%`
B. `4%`
C. `0.0314%`
D. `2.1%`

Answer

To determine the CO₂ content by volume in atmospheric air, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Atmospheric Composition**:
- The atmosphere is composed of various gases, with nitrogen (N₂) and oxygen (O₂) being the most abundant. Other gases, including carbon dioxide (CO₂), are present in much smaller quantities.

2. **Identifying CO₂ Levels**:
- The question provides multiple-choice options for the CO₂ content in the atmosphere:
- a) 3.34%
- b) 4%
- c) 0.0314%
- d) 2.1%

3. **Recognizing the Typical CO₂ Concentration**:
- Generally, the concentration of CO₂ in the atmosphere is approximately 0.04% (or 400 parts per million). This is a well-established figure in environmental science.

4. **Comparing Options**:
- Among the provided options, we need to identify which one is closest to the recognized value of approximately 0.04%.
- The option that aligns with this value is c) 0.0314%.

5. **Final Conclusion**:
- Therefore, the correct answer to the question regarding the CO₂ content by volume in atmospheric air is **c) 0.0314%**.