>>12213918We are not talking about size. A mole is just a specific number of things. A mole means 6.02x10^23 like a dozen means 12. Like, if you had a dozen of two-seater cars, you'd have two dozens of seats.
1 molecule of N2O is a particle, and a mole has 6.02x10^23 of them. However, inside its structure there are twice as many nitrogen atoms. Hence, two moles.
