One mole of helium gas represents

Options

A. `6.023xx10^(23)He`
B. `6.023xx10^(23)He_(2)`
C. `3.011xx10^(23)He_(2)`
D. `12.069xx10^(23)He`

Explanation

To solve the question "One mole of helium gas represents," we need to understand the concept of moles in chemistry, particularly in relation to gases. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Definition of a Mole
A mole is a unit in chemistry that represents a specific number of particles, which can be atoms, molecules, ions, etc. One mole of any substance contains approximately \(6.022 \times 10^{23}\) particles. This number is known as Avogadro's number.

**Hint:** Remember that a mole is a counting unit in chemistry, similar to a dozen in everyday life.

### Step 2: Identify the Nature of Helium
Helium is a noble gas and is classified as a monoatomic gas. This means that each helium gas molecule consists of a single helium atom.

**Hint:** Monoatomic gases consist of single atoms, while diatomic gases consist of pairs of atoms.

### Step 3: Calculate the Number of Atoms in One Mole of Helium
Since one mole of any substance contains \(6.022 \times 10^{23}\) particles, and helium is monoatomic, one mole of helium gas will contain \(6.022 \times 10^{23}\) helium atoms.

**Hint:** For monoatomic gases, the number of moles directly translates to the number of atoms.

### Step 4: Evaluate the Options Given
Now, let's evaluate the options provided in the question:
- **A:** \(6.022 \times 10^{23}\) helium atoms (correct)
- **B:** \(6.022 \times 10^{23}\) helium molecules (incorrect, as helium is monoatomic)
- **C:** Helium diatomic (incorrect, as helium does not exist as diatomic)
- **D:** Any other incorrect option

**Hint:** Always check if the gas is monoatomic or diatomic when evaluating options.

### Conclusion
Therefore, one mole of helium gas represents \(6.022 \times 10^{23}\) helium atoms.

**Final Answer:** One mole of helium gas represents \(6.022 \times 10^{23}\) helium atoms (Option A).