CAS CH 171 Lecture Notes - Lecture 3: Deuterium

• School: Boston University
• Department: Chemistry
• Course: CAS CH 171
• Professor: Blair Szymczyna

Document Summary

Standard atomic weights: are relative to one another, have units (u): 1u = 1. 661x10-24g, dalton (da) = u, averages over all isotopes. Problem: calculate average atomic weight of hydrogen from h 1, h 2, and h 3. H 1 = 1. 0077u, h 2 = 2. 013u, h 3 = 3. 018u (1. 0077)(0. 99988) + (2. 013)(0. 0001. 056) + (3. 018)(0. 0000144) = Avogadro"s number: the mole: converts atomic mass units to grams, 1 mole (mol) = 6. 022x1023 atoms/molecules, 1 mol of n atoms (14. 007u) = 6. 022x1023 n atoms = 14. 007g n. 25g x 1 mol/180. 15 g x 6 mol c/ 1 mol glu = 0. 84 mol c.