CHE-121-Written Assignment 3.docx

CHE-121-Written Assignment 3.docx - Name Ashley Law College...

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Name: Ashley Law College ID: 0631739 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: Jun 2018 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) 5.10 * (6.02 x 10 23 )= 3.07 x 10 24 (Reference: Chang 3.13) 2. How many moles of calcium (Ca) atoms are there in 77.4 g of Ca? (6 points) 77.4g * (1 mol/ 40.1g)= 1.93 mol (Reference: Chang 3.15) 3. What is the mass in grams of 1.00 × 10 12 lead (Pb) atoms? (8 points) 1.00 x 10 12 * (1 mol/ 6.02 x 10 23 ) * (207.2g/ 1 mol)= 3.44 x 10 -10 (Reference: Chang 3.19) 4. Describe how you would determine the isotopic abundance of an element from its mass spectrum. (6 points) To determine the isotopic abundance of an element from its mass spectrum you would have to use a mass spectrometer. The mass spectrometer turns atoms into to ions, then separates the ions by passing them through an electric field and then through a magnetic field to fan them out into a spectrum.
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