One mole of oxygen gas at STP is equal to ...........

Options

A. `6.022xx10^(23)` molecules of oxygen
B. `6.022xx10^(23)` atoms of oxygen
C. 16 of oxygen
D. `7xx10^(23)` atoms of oxygen

Explanation

To solve the question "One mole of oxygen gas at STP is equal to...", we need to analyze the properties of one mole of a substance, specifically oxygen gas (O₂), at standard temperature and pressure (STP).

### Step-by-Step Solution:

1. **Understanding Moles**:
- One mole of any substance contains Avogadro's number of particles, which is approximately \(6.022 \times 10^{23}\). This number can represent atoms, molecules, or formula units depending on the substance.

2. **Identifying the Substance**:
- In this case, we are dealing with oxygen gas (O₂). Each molecule of oxygen gas consists of 2 oxygen atoms.

3. **Calculating Molecules in One Mole of O₂**:
- Since one mole of O₂ contains \(6.022 \times 10^{23}\) molecules of O₂, this means that in one mole of oxygen gas, there are \(6.022 \times 10^{23}\) molecules of O₂.

4. **Calculating Atoms in One Mole of O₂**:
- Each molecule of O₂ contains 2 oxygen atoms. Therefore, in one mole of O₂, the total number of oxygen atoms is:
\[ 2 \times (6.022 \times 10^{23}) = 1.2044 \times 10^{24} \text{ atoms of oxygen} \]

5. **Determining the Mass of One Mole of O₂**:
- The molecular weight of oxygen (O) is approximately 16 g/mol. Since O₂ consists of two oxygen atoms, the molecular weight of O₂ is:
\[ 16 \text{ g/mol} \times 2 = 32 \text{ g/mol} \]
- Therefore, one mole of oxygen gas (O₂) weighs 32 grams.

### Conclusion:
From the analysis, we can conclude that:
- One mole of oxygen gas at STP is equal to \(6.022 \times 10^{23}\) molecules of O₂ (Option 1).
- One mole of oxygen gas at STP is also equal to 32 grams of O₂ (Option 4).

### Final Answer:
One mole of oxygen gas at STP is equal to:
- \(6.022 \times 10^{23}\) molecules of oxygen (Option 1)
- 32 grams of oxygen (Option 4)

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