Answer: 2.5 moles of Argon, Ar contains 15.055 x 10^23 particles. ✅
Step-by-step explanation:
To find the number of particles in 2.5 moles of Argon, we can use the Avogadro's number. Avogadro's number is the number of atoms, ions or molecules in one mole of a substance. It is defined as 6.022 x 10^23 particles per mole.
To convert moles to particles, we can multiply the number of moles by Avogadro's number.
2.5 moles x 6.022 x 10^23 particles/mole = 15.055 x 10^23 particles
So, 2.5 moles of Argon, Ar contains 15.055 x 10^23 particles.