Problem Set 3 Key CHEM103A Dr. Keller

Problem Set 3 Key CHEM103A Dr. Keller - CHEMISTRY 103A,...

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N N C C C C C C H C F H H Br Br Br H H H H H H CHEMISTRY 103A, Sections 7-10 Problem Set 3: 12 Points Answer Key Problems 1-7 deal with a molecular compound, the structural formula of which is shown below. Problem 1. What is the molecular formula of this compound? (Note: Be absolutely certain that your formula is correct. If it is not, all the answers for 2-7 will be wrong. The formula would normally be written with the element symbols in the order CHNBrF) C 7 H 9 N 2 Br 3 F Problem 2. Calculate the weight in grams of one mole of this compound. One decimal place is sufficient. The weight of one mole of the compound is the sum of the atomic weights (g/mol) of the elements: 7(12.01) + 9(1.008) + 2(14.01) + 3(79.90) + 1(19.00) = 379.9 g In other words, the molecular weight is 379.9 g/mol. Problem 3. Calculate the weight in grams of one molecule of this compound.
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22 23 379.9 1 6.309 10 / 1 6.022 10 g mol g molecule mol molecules - = 23 25 6.022 10 22 1.325 10 / 1 1 molecules atoms atoms mol
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Problem Set 3 Key CHEM103A Dr. Keller - CHEMISTRY 103A,...

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