The number of moles of argon gas can be calculated using Avogadro's number, which is equal to 6.022 x 10^23 particles per mole.

Using the formula:

Moles of argon gas = (Given number of particles) / (Avogadro's number)

Moles of argon gas = (7.52 x 10^23 particles) / (6.022 x 10^23 particles/mole)

Moles of argon gas ≈ 1.25 moles

Therefore, 7.52 x 10^23 particles of argon gas are equivalent to approximately 1.25 moles of argon gas.