WA3_CHE-121-jun16 - Name College ID Thomas Edison State...

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Name: College ID: Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: OL121 Semester and year: July 2016 Written Assignment 3: Mass Relationships for Compounds Answer all assigned questions and problems, and show all work. 1. How many atoms are there in 5.10 moles of sulfur (S)? (6 points) 5.1x(6.022x10^23)=3.07x10^24 (Reference: Chang 3.13) 2. How many moles of calcium (Ca) atoms are there in 77.4 g of Ca? (6 points) 77.4x1/40.1=1.93mol (Reference: Chang 3.15) 3. What is the mass in grams of 1.00 × 10 12 lead (Pb) atoms? (8 points) 1x10^12x207.2/6.02x10^23=3.44gx10^-10 (Reference: Chang 3.19) 4. Describe how you would determine the isotopic abundance of an element from its mass spectrum. (6 points) Using Mass spectrometer can determine the isotopic abundance. (Reference: Chang 3.32) 5. Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is C 9 H 10 O. a. Calculate the percent composition by mass of C, H, and O in cinnamic alcohol. (8 points) b. How many molecules of cinnamic alcohol are contained in a sample of mass 0.469 g? (8
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  • Spring '15
  • Khurana
  • Chemistry, Thomas Edison State College

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