Here's how to calculate the average velocity of neon atoms at 308 K:

1. Understand the Concept

The average velocity of gas particles is related to their kinetic energy, which is directly proportional to temperature. We can use the root-mean-square (rms) velocity to represent this average velocity.

2. Formula

The rms velocity (v_rms) is given by:

v_rms = √(3RT/M)

where:

* R is the ideal gas constant (8.314 J/mol·K)

* T is the temperature in Kelvin

* M is the molar mass of the gas in kg/mol

3. Calculate the Molar Mass of Neon

Neon has an atomic mass of approximately 20.18 g/mol. Convert this to kg/mol:

M = 20.18 g/mol * (1 kg / 1000 g) = 0.02018 kg/mol

4. Plug in the Values

v_rms = √(3 * 8.314 J/mol·K * 308 K / 0.02018 kg/mol)

5. Calculate the Result

v_rms ≈ 517 m/s

Therefore, the average velocity of neon atoms in 2.00 mol of neon at 308 K is approximately 517 m/s.

Important Note: The number of moles (2.00 mol) doesn't affect the average velocity. The rms velocity depends only on the temperature and the molar mass of the gas.