1. Elemental Analysis

2. What is elemental analysis?  Process where a sample of a compound is burned in a furnace to form CO 2 and H 2 O  Combustion reaction occurs as oxygen gas goes through the sample  All gases produced are collected  Based on these collections, the mass of each element in the compound is determined  Convert lab data into % composition

3. Ex. 1 Aspirin is composed of carbon, hydrogen, and oxygen. Using a 3.00 mg sample, an elemental analysis experiment yields 6.60 mg of CO 2 and 1.20 mg of H 2 O. What is the empirical formula for aspirin?

4. Ex. 2 A compound containing carbon, hydrogen, and oxygen is burned to give 0.1953 g CO 2 and 0.1000 g H 2 O. The molecular mass is 90u. If the original sample had a mass of 0.1000g, what is the molecular formula for this compound?

5. Ex. 3 You Try! Combustion analysis was performed on a 2.04g sample consisting of C, H, and O. The analysis produced 4.49g of CO 2 and 2.45g of H 2 O. What is the empirical formula for this compound?

6. Mole Review Problems  Mole Conversions  25g H 2 SO 4 to moles  5 moles H 2 to grams  15g H 2 O to molecules  1.10x10 22 molecules of CuSO 4 to moles  2 moles CaCl 2 to grams

7. Formula Mass Review Problems 1)CuO6) C 5 H 8 NNaO 4 2)AgNO 3 7) C 22 H 24 N 2 O 8 3)(NH 4 ) 3 PO 4 8) Fe(NO 3 ) 3 4)C 6 H 12 O 6 9) CH 3 CSNH 2 5)Al 2 (SO 4 ) 3 10) CH 3 CO 2 H 11) C 8 H 10 N 4 O 2

8. Homework  Review concepts on pp. 75-82  Read pp. 89-91  Problems pp. 116-117 #18, 22, 24, 47-49  Review Problems