1441test2 - 1441 Exam 2 and Answers Chapters 3 and 4 Text...

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1441 Exam 2 and Answers: Chapters 3 and 4 - Text: McMurry and Fay Chapter 3 Concepts Dimensional Analysis ( Mole Concept) 1. 46 g of water = ___ moles. 2. 3.5 moles of NaOH = ___ g 3. 60 g of CO 2 = ___ CO 2 molecules 4. 30 g of H 2 SO 4 = ___ O atoms 5. What is the mass of one atom of Mg? Empirical and Molecular Formulas ( change to moles, divide by smallest to get the lowest whole number ratio, multiply by a factor to make whole numbers if necessary) 6. Adipic acid contains: 49.32% C, 43.84% O, and 6.85% H by mass. What is the empirical formula for adipic acid? 7. If the molecular mass of adipic acid it 146 amu, what is the molecular formula? Percent Composition 8. What is the % of O in KClO 3 ? Stoichiometric Problems 9. When 6 g of H 2 reacts with an excess of O 2 , how many grams of H 2 O will be produced? Limiting Reactants 10. How many grams of CO 2 will be produced when 3.0 g of C 2 H 4 reacts with 3.0 g of O 2 ? ( ans. 2.8) % Yield 11. 30 grams of H 2 reacts with an excess of O 2 and produces 190 g of water. What is the % yield? (ans. 70.4) Balance Equations 12. Balance: H 2 SO 3 + O 2 H 2 SO 4 Ca(NO 3 ) 2 + AlPO 4 Ca 3 (PO 4 ) 2 + Al(NO 3 ) 3 Chapter 4 (Types of Chemical Reactions and Solution Stoichiometry) 13. Write the net ionic reaction for the following reactions:
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(a) NaOH + HCl (b) AgNO 3 + CaCl 2 (c) HC 2 H 3 O 2 + KOH 14. __ g of NaOH is required to make 200 ml of 3M NaOH. 15. 30 g of NaOH is dissolved in enough water to make 300 ml. What is the M? 16. How many ml of water must be added to 300 ml of 3M KOH to change it to 1.5 M KOH? 17. How many ml of 2 M Ca(OH) 2 are required to exactly neutralize 400 ml of 1.5 M HCl?
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