Elemental Analysis. 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.

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Presentation transcript:

Elemental Analysis

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

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?

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

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?

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

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

Homework  Review concepts on pp  Read pp  Problems pp #18, 22, 24,  Review Problems