Final answer:
To calculate the moles of TB given 4.25x10^25 atoms, divide the given number of atoms by Avogadro's number, which is 6.022x10^23 atoms/mol. The correct answer is a. 7.07 mol.
Step-by-step explanation:
To calculate the moles of TB given 4.25x10^25 atoms, we can use Avogadro's number, which is 6.022x10^23 atoms/mol. We divide the given number of atoms by Avogadro's number to get the moles of TB:
Moles = (4.25x10^25 atoms) / (6.022x10^23 atoms/mol) = 7.07 mol
Therefore, the correct answer is option a) 7.07 mol.