CHEM101 Lecture 11: Stoichiometry Review

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

Chem 101 - lecture 11 - stoichiometry review. Quiz - fri oct. 9 - wednesday oct. 14 (includes online lecture and two in class lectures on all aspects of lewis structure. Empirical formula of hydrogen peroxide: ho so h to o ratio is 1:1. Structural formula: which atoms, exact numbers, arrangement of atoms. Example problem 1: find the empirical and molecular formulas for a compound with 71. 65% A different measurement gives the molar mass of the compound as. Cl = (71. 65 g/ 35. 45 g/mol) = 2. 021 mol of cl. C = (24. 27 g/ 12. 01 g/mol) = 2. 021 mol of c. H = (4. 07 g/ 1. 008 g/mol) = 4. 04 mol of h. Molar mass of empirical formula: 12. 01 + 2(1. 008) + 35. 45 = 49. 48 g/mol. Molar mass of the compound given (molecular formula): 98. 96 g/mol. Example problem 2: if your ratio is 1:1. 5:1. 33.