This is kind of a pretty easy question:
- In order to get the number of atoms/entities of Neon, you will have to turn that 1009g of Neon into moles
-And then you have to use the moles and calculate it using Avogadro's Number which is 6.02 x 10^23
number of moles = mass/molar mass of element/compound
n = 1009g/20.18g/mol
n = 50 mol
Number of atoms/entities = 50 x (6.02 x 10^23)
Number of atoms in 1009g of neon is 3.01 x 10^25 (scientific notation because its a really long number)