CH 3 - notes 2 - formulas

# CH 3 - notes 2 - formulas - 2 O 4 d diphenyl ether C 12 H...

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AP chem – O’Malley Chapter 3 – stoichiometry 2 Name: ____________________ Text: p 89 – 96 (3.5 – 3.6) (percent composition & formulas) © S. O’Malley 2011 PERCENT COMPOSITION EX What is the percent by mass of carbon in ethanol, C 2 H 5 OH? 3.9 What is the percent by mass of hydrogen in carvone, C 10 H 14 O? 3.10 What is the percent by mass of nitrogen in penicillin, C 14 H 20 N 2 SO 4 ? EMPIRICAL FORMULAS 3.11 What is the formula of a compound with 24.27% C , 4.07% H , 71.65% Cl with a molar mass of98.96 g/mol? 3.12 What is the formula of a compound with 43.64% P and 56.36% O and a molar mass of 283.88? 3.13 What is the formula of a compound with 49.48% C , 5.15% H , 28.87% N , 16.49% O and molar mass of 194.2?

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Problems taken from Zumdahl, 7 th ed. HOMEWORK (CH 3 – part 2) 3.18 Which of the following pairs of compounds have the same empirical formula? a. acetylene, C 2 H 2 , and benzene, C 6 H 6 b. ethane, C 2 H 6 , and butane, C 4 H 10 c. nitrogen dioxide, NO 2 , and dinitrogen tetroxide, N
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Unformatted text preview: 2 O 4 d. diphenyl ether, C 12 H 10 O, and phenol, C 6 H 5 OH 3.65 Calculate the percent by mass of each element in each of the following compounds: a. formaldehyde, CH 2 O b. glucose, C 6 H 12 O 6 c. acetic acid, HC 2 H 3 O 2 3.67 Give the empirical formula for each of the compounds represented below: 3.69 The compound adrenaline contains 56.79% C, 6.56% H, 28.37% O, and 8.28% N by mass. What is the empirical formula for adrenaline? 3.75 Adipic acid is an organic compound composed of 49.31% C, 43.79% O, and the rest hydrogen. If the molar mass of adipic acid is 146.1 g/mol, what are the empirical and molecular formulas for adipic acid? 3.18 (a) and (c) are pairs with the same empirical formulas 3.65 (a) 39.99% C, 6.713% H, 53.30% O (b) 40.00% C, 6.714% H, 53.29% O, (c) 40.00% C, 6.714% H, 53.29% O 3.67 (a) NO 2 (b) CH 2 (c) P 2 O 5 (d) CH 2 O 3.69 C 8 H 11 O 3 N 3.75 C 3 H 5 O 2 ; C 6 H 10 O 4...
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## This note was uploaded on 09/19/2011 for the course CHEM 1110 taught by Professor Hansen during the Fall '11 term at St. Johns Duplicate.

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CH 3 - notes 2 - formulas - 2 O 4 d diphenyl ether C 12 H...

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