Workbook_Unit3 - A dd masses down column for total molar...

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Add masses down column for total molar mass SC155 – Introduction to Chemistry Unit 3 – Study Guide Please use the Thinkwell Videos and notes pages (found in Doc Sharing) to help you complete this guide. Section 1 – Key Terms and Concepts reactant product stoichiometric coefficient mole conversion factor Avogadro’s number molar mass (formula mass) atomic mass empirical formula molecular formula chemical formula limiting reagent (reactant) theoretical yield percent yield Section 2 – Mathematical Concepts Solving Simple Conversions - Conversion factors are quantities of equal value. They are an important part of the problems in this course. Remember, it is important to first determine what units you need to get and what units you have. This will help you to determine the conversion factor you will need to solve the problem. Reading a Chemical Formula - Please see the “Decoding a Chemical Formula” guide located in Doc Sharing. It is imperative that you are able to accurately determine the number of atoms of each element present in a given compound. Gram to Mole (and Mole to Gram) conversions use molar mass as a conversion factor. Mole to Molecule (and Molecule to Mole) conversions use Avogadro’s Number. Section 3 – Practice Problems 1. Use the reaction below to answer the following questions.
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+ O 2 2 CuO a. List the reactant(s). ___________________________ b. List the product(s). ___________________________ c. What is the stoichiometric coefficient for 1. Cu ______ 2. O 2 ______ 3. CuO ______ d. What is the molar ratio between the following: 1. Cu : CuO __________ 2. O 2 : CuO __________ e. How many moles of Cu are required to react with: 1. 2 moles of O 2 ? 2. 6 moles of O 2 ? f. Assuming there is ample O 2 , how many moles of CuO will be made from: 1. 3.5 moles of Cu? 2. 13.1 moles of Cu? 2. Calculate the molar mass of the following compounds. 1. CaCO 3 2. H 2 O 3. C 4. Ca 3 (PO 4 ) 2 3. Balance the following reactions. NaCl + H 2 SO 4 Na 2 SO 4 + HCl NH 3 + O 2 N 2 + H 2 O 4. Which reaction is not balanced? ZnS
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This note was uploaded on 05/01/2011 for the course SCIENCE 155 taught by Professor Bassa during the Spring '11 term at Kaplan University.

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Workbook_Unit3 - A dd masses down column for total molar...

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