There are exactly #6.022xx10^23# atoms in exactly one mole of atoms.
Explanation:
Avogadro's number, #6.022xx10^23# is the number of particles or objects in one mole of anything. One mole of cars would be #6.022xx10^23# cars. So, in the case of one mole of atoms, there would be #6.022xx10^23# atoms.