CHEZ 302 Second Test November 23, 2015 For each of the following questions, mark

Question

CHEZ 302 Second Test November 23, 2015 For each of the following questions, mark the correct answer on the answer sheet. Each correct answer is worth 4 (four) points. Molar masses: Carbon 12.01 g/mol Hydrogen- 1.01 g/mol Nitrogen 14.01 g/mol Oxygen 16.00 g/mol I. What is the mass percent of carbon in a compound which has a molecular formula of CaH:0? a. 85.6% b. 92.2% 71.9 % 60.00 % OH 2. What is the empirical formula of A TLC (silica gel, ethyl acetate) was run on the crude product from the electrophilic aromatic substitution reaction, the recrystallized product, and the filtrate from the recrystallization: 3. A crude product B recrystalliz ed product C fitrate from recrystalization experimentai mp of recrystalized product 203-205 c it mp o-nitroacetanilide 94C mp p- acetanide s 214-217°C ABC Which compound is less polar? a. o-nitroacetanilide b. p-nitroacetanilide c. they both have the same polarity

Explanation / Answer

Question 1 You need to multiply the molecular weight of the carbon by the number of carbons atoms. The result is 71.99 % Question 2 The empirical formula is C8H8O2, when you count the elements, you need to take atention to the double bounds and Hydrogens present. Question 3 The o-nitroacetanilide is less polar because the interation of the oxigen and the hydrogen is more strong (Hydrogen bridge) than with the solvent.

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