Final answer:
To find the number of moles of 7.6 x 10^24 atoms of helium, divide the number of atoms by Avogadro's number (6.02 x 10^23 atoms/mol). The result is 12.6 moles.
Step-by-step explanation:
To find the number of moles, we can use Avogadro's number, which states that 1 mole of any substance contains 6.02 x 10^23 particles (atoms or molecules). In this case, we have 7.6 x 10^24 atoms of helium. To convert atoms to moles, we divide the number of atoms by Avogadro's number:
Number of moles = Number of atoms / Avogadro's number
Number of moles = 7.6 x 10^24 atoms / 6.02 x 10^23 atoms/mol = 12.6 moles