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Chap_3_HW_solutions

# Chap_3_HW_solutions - Chapter 3 homework solutions

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Chapter 3 Homework Worked Solutions 30. Assume silicon has three major isotopes in nature as shown in the table below. Fill in the missing information. Isotope Mass (amu) Abundance 28 Si 27.98 29 Si 4.70 % 32 Si 29.97 3.09 %

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56. Complete the following table. Mass of Sample Moles of Sample Molecules of Sample Total atoms in sample 4.24 g C 6 H 6 0.224 mol H 2 O 2.71 x 10 22 molecules CO 2 3.35 x 10 22 total atoms in CH 3 OH sample
60. Anabolic steroids are performance enhancement drugs whose use has been banned from most major sporting activities. One anabolic steroid is fluoxymesterone (C 20 H 29 FO 3 ). Calculate the percent composition by mass of fluoxymesterone. 64. Fungal laccase, a blue protein found in wood-rottung fungi, is 0.390% Cu by mass. If a fungal laccase molecule contains 4 copper atoms, what is the molar mass of fungal laccase?

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72. A sample of urea contains 1.121 g N, 0.161 g H, 0.480 g C, and 0.640 g O. What is the empirical formula of urea?
76. Maleic acid is an organic compound composed of 41.39% C, 3.47% H, and the rest oxygen. If 0.129 mol of maleic acid has a mass of 15.0 g, what are the empirical and molecular formulas of maleic acid?

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