CHEM118 HW2.pdf - Name CHEM118 Homework#2 1 Given the percent abundance of the isotopes of neon shown in the given table calculate the atomic mass of

CHEM118 HW2.pdf - Name CHEM118 Homework#2 1 Given the...

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Name ________________________________ CHEM118 Homework #2 1 Dr. Wilson 1. Given the percent abundance of the isotopes of neon shown in the given table, calculate the atomic mass of neon. 20 Ne 90.48 % 19.992440 u 21 Ne 0.27 % 20.993847 u 22 Ne 9.25 % 21.991386 u 2. The five-cent U.S. coin called a nickel is actually composed of 75% copper and 25% nickel. Since the mass of a nickel is 5.000g, how many copper and nickel atoms are present in each coin? 3. The therapeutic properties of willow bark have been known for at least 2,400 years, but Edward Stone was the first to isolate the active ingredient, salicyclic acid, in 1763. 1 a. Since the chemical formula for salicyclic acid is C 7 H 6 O 3 , calculate the molar mass. b. How many oxygen atoms are present in 50mg of salicyclic acid? 1 Stone, E. (1763). Philosophical Transactions of the Royal Society of London
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Unformatted text preview: 53 : 195–200. Name ________________________________ CHEM118 Homework #2 2 Dr. Wilson 4. Calculate the percent composition of each element in the fertilizer ammonium nitrate, NH 4 NO 3 . 5. Some diamonds appear yellow because they contain nitrogen compounds which absorb light of frequency 7.23 x 10 14 Hz. Calculate the wavelength (in nm) of the absorbed light. 2 6. Calculate the energies of one photon of ultraviolet ( λ = 1x10-8 m), visible ( λ = 5x10-7 m), and infrared ( λ = 1x10-4 m) light. What do the answers indicate about the relationship between the wavelength and energy of light? 3 2 Silverberg. (2006). Chemistry: The Molecular Nature of Matter and Change , 4 th edition: 260. 3 Silverberg. (2006). Chemistry: The Molecular Nature of Matter and Change , 4 th edition: 263....
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  • Spring '16
  • Mike Slade

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