How many atoms are in a sample of 85.979 g of iodine?

Answer 1

1mole I atoms = 126.90447g

1 mole I atoms = 6.022 x 1023 atoms I

Convert grams I to moles I

85.979g I x (1mol I/126.90447g I) = 0.67751mol I

Convert moles I to atoms I

0.6775mol I x (6.022 x 1023 atoms I/1mol I) = 4.080 x 1023 atoms I

Answer 2

To find the number of atoms in a sample, you first need to calculate the number of moles of iodine in 85.979 g using the molar mass of iodine (126.904 g/mol). Then, use Avogadro's number (6.022 x 10^23) to convert moles to atoms.