Final answer:
To calculate the number of moles of silver in 1.8 x 10^20 atoms of Ag, divide the number of silver atoms by Avogadro's number, yielding approximately 2.99 x 10^-4 moles of Ag.
Step-by-step explanation:
To find out how many moles of silver (Ag) there are in 1.8 × 1020 atoms of silver, we need to use Avogadro's number, which is 6.022 × 1023 atoms/mole. This number tells us how many atoms are in one mole of any substance. The calculation is straightforward:
moles of Ag = (number of atoms) / (Avogadro's number)
moles of Ag = (1.8 × 1020 atoms) / (6.022 × 1023 atoms/mole)
By dividing the number of silver atoms by Avogadro's number, we get the number of moles of Ag, which is approximately 2.99 × 10-4 moles.