The volume of oxygen present in 750 l of air is _____

Options

A. 172.5 l
B. 187.5 l
C. 157.5 l
D. 225.5 l

Explanation

To find the volume of oxygen present in 750 liters of air, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of Air**:
Air is made up of various gases, and one of the main components is oxygen, which constitutes about 21% of air.

2. **Identify the Total Volume of Air**:
We are given that the total volume of air is 750 liters.

3. **Calculate the Volume of Oxygen**:
To find the volume of oxygen, we need to calculate 21% of the total volume of air (750 liters).
- The formula to calculate the volume of oxygen is:
\[ \text{Volume of Oxygen} = \left(\frac{21}{100}\right) \times \text{Total Volume of Air} \]
- Substituting the values:
\[ \text{Volume of Oxygen} = \left(\frac{21}{100}\right) \times 750 \]

4. **Perform the Calculation**:
- First, calculate \( \frac{21}{100} \):
\[ \frac{21}{100} = 0.21 \]
- Then multiply by 750:
\[ 0.21 \times 750 = 157.5 \]

5. **Conclusion**:
The volume of oxygen present in 750 liters of air is **157.5 liters**.

### Final Answer:
The volume of oxygen present in 750 liters of air is **157.5 liters**.

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