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Unformatted text preview: Dr. Jim Bloxton NAME CHEM 1021 Fall 2009 Take Home Lecture Quiz 4 For Chapter 4 (9 th Edition) (Chapter 5: 8 th Edition) Answer Key Take Home Lecture Quiz 4 on chapter 4 (9 th Edition) or (Chapter 5: 8 th Edition) is due at the beginning of Chem 1021 recitations that start on Thursday, 11/5/09, and continue through Wednesday, 11/11/09. This take home lecture quiz must be shown to your Chem 1021 recitation instructor at the beginning of Chem 1021 recitations that start on Thursday, 11/5/09, and continue through Wednesday, 11/11/09. Students must be present for all of the recitation in order to receive credit. Only original handwritten materials will be accepted. Typed, computer generated or photocopies will not be accepted. Late materials will not be accepted. 1. Calculate the formula weight of (NH 4 ) 2 SO 4 . Show all calculations. N: 2 x 14.01 = 28.02 H: 8 x 1.01 = 8.08 S: 1 x 30.07 = 32.07 O: 4 x 16.00 = 64.00 Formula weight = 132.17 amu and molar mass of (NH 4 ) 2 SO 4 is 132.17 g/mol. 2. How many moles are found in 24.5 g of (NH 4 ) 2 SO 4 ? Show all calculations. Calculate moles of (NH 4 ) 2 SO 4 by using n = mass ÷ molar mass Use the molar mass of (NH 4 ) 2 SO 4 from problem 1....
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This note was uploaded on 03/29/2011 for the course CHEMISTRY 1021 taught by Professor Jimbloxton during the Fall '09 term at Temple.
 Fall '09
 JimBloxton
 Chemistry

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