Tom F. answered • 12/07/21
Tutor
5
(8)
Medical Student with Bachelor's Degree in Chemistry
(1) First, determine to total number of individual molecules of Fe(NO3)3 in 7.23 moles. Use Avogadro's number for this: 1 mole = 6.02 x 1023 molecules. Thus, 7.23 moles x 6.02 x 1023 = 4.35 x 1024 molecules of Fe(NO3)3.
(2) Determine how many oxygen atoms in one molecule of Fe(NO3)3. There are 3 O in the nitrate NO3, and 3 nitrate groups in Fe(NO3)3. Thus, 3 x 3 = 9 O atoms in 1 molecule of Fe(NO3)3.
(3) Finally, multiply the number of O atoms in 1 molecule of Fe(NO3)3 by the total number of Fe(NO3)3 molecules. 9 x 4.35 x 1024 = 3.92 x 1025 total Oxygen atoms
