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Because 1 mole is equal to 6.02 x 10^23 . (According to Avogardo . The number of particles in one mole of a substance)
...**How many molecules are there in 4.0 **molecules.
Use dimensional anaysis , convert numbers of mole into numbers of particle.
4.0 moles CO2 x 6.02 x 10^23 molecules CO2 / 1 mole CO2
(just cancel the moles of 4.0 moles CO2 to 1 mole CO2 )
(multiply 4.0 moles CO2 to 6.02 x 10^23 molecules CO2)
and you'll get ---->>> 2.41 x 10 ^24 Molecules CO2