Chemistry_1031_day9_020909_actual

# Chemistry_1031_day9_020909_actual - General Chemistry I...

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General Chemistry I CHE-1031 Dr. Jonathan M. Smith Monday, February 9

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Today 3.9 – 3.10 Empirical Formulas; Molecular Formulas; Balancing Equations Re-Read Ch. 3 Read Ch. 4 section 1-3 In class exam Friday, Feb. 20
Element 118!…

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Molecules, Compounds, and Chemical Equations Chapter 3 continued…
Tro, Chemistry: A Molecular Approach 5 Example: Find the empirical formula of aspirin with the given mass percent composition. Write down the given quantity and its units. Given: C = 60.00 wt% H = 4.48 wt% O = 35.53 wt% Therefore, in 100 g of aspirin there are 60.00 g C, 4.48 g H, and 35.53 g O

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Tro, Chemistry: A Molecular Approach 6 Write down the quantity to find and/or its units. Find: empirical formula, C x H y O z Example: Find the empirical formula of aspirin with the given mass percent composition. Information Given:60.00 g C, 4.48 g H, 35.53 g O
Tro, Chemistry: A Molecular Approach 7 Write a Concept Plan: g C, H, O mol C, H, O mol ratio empirical formula Example: Find the empirical formula of aspirin with the given mass percent composition. Information Given:60.00 g C, 4.48 g H, 35.53 g O Find: Empirical Formula, C x H y O z

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Tro, Chemistry: A Molecular Approach 8 Collect Needed Relationships: 1 mole C = 12.01 g C 1 mole H = 1.008 g H 1 mole O = 16.00 g O Example: Find the empirical formula of aspirin with the given mass percent composition. Information Given:60.00 g C, 4.48 g H, 35.53 g O Find: Empirical Formula, C x H y O z CP: g C,H,O mol C,H,O mol ratio empirical formula
Molecular Approach 9 Apply the Concept Plan: calculate the moles of each element Example: Find the empirical formula of aspirin with the given mass percent composition. C mol 996 4 C g 12.01 C mol 1 C g 00 60 . . = × H mol 44 . 4 H g 1.008 H mol 1 H g .48 4 = × O mol 220 . 2 O g 16.00 O mol 1 O g 5.53 3 = × Information Given:60.00 g C, 4.48 g H, 35.53 g O Find: Empirical Formula, C

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## This note was uploaded on 05/09/2010 for the course CHEM 1031 taught by Professor Thomas during the Spring '06 term at Temple.

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Chemistry_1031_day9_020909_actual - General Chemistry I...

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