#Chem 161-2007 Chapter 3B-Stoichiometry practice problems

#Chem 161-2007 Chapter 3B-Stoichiometry practice problems -...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHEM 161-2007 CHAPTER 3B - STOICHIOMETRY PRACTICE PROBLEMS DR. ED TAVSS Balancing chemical reactions Reaction stoichiometry Solution Conc.: Molarity Limit. reactants & % yield BALANCING CHEMICAL REACTIONS 10 Chem 161-2006 Exam I Hill, Petrucci et al., 4 th edition Chapter 3 Stoichiometry: Chemical Calculations Balancing chemical equations In the combustion of hexane, C 6 H 14 , reacts with O 2 to produce carbon dioxide and water. How many moles of O 2 are required to react with 1.0 mole of hexane? A . 9.5 B. 19 C. 9 D. 9 E. 3 C 6 H 14 + O 2 CO 2 + H 2 O C 6 H 14 + O 2 6CO 2 + H 2 O C 6 H 14 + O 2 6CO 2 + 7H 2 O C 6 H 14 + 19/2 O 2 6CO 2 + 7H 2 O 2C 6 H 14 + 19O 2 12CO 2 + 14H 2 O A 24 Chem 161-2005 Hourly Exam II Chapter 3 - Stoichiometry Balancing chemical equations In the combustion of butane, C 4 H 10 , butane reacts with O 2 to produce carbon dioxide and water. When the equation for this combustion is balanced with the smallest possible integer coefficients, what is the coefficient of O 2 A. 4 B. 5 C. 7 D. 9 E . 13 C 4 H 10 + O 2 CO 2 + H 2 O C 4 H 10 + O 2 4CO 2 + H 2 O C 4 H 10 + O 2 4CO 2 + 5H 2 O C 4 H 10 + 13/2 O 2 4CO 2 + 5H 2 O 2C 4 H 10 + 13O 2 8CO 2 + 10H 2 O 14. Chem 161-2004 Exam I Zumdahl 6 th edition Chapter 3 Balancing Chemical Equations Consider the reaction wPCl 5 + xH 2 O yPOCl 3 + zHCl This equation is balanced when A. choose this choice if none of the others is correct B . w = 1, x = 1, y = 1, z = 2 C. w = 2, x = 2, y = 2, z = 1 D. w = 2, x = 2, y = 2, z = 2 E. w =1, x =2, y = 2, z = 4 wPCl 5 + xH 2 O yPOCl 3 + zHCl Begin with the most complex molecule, which is either PCl5 or POCl3. The Ps are already balanced. Balance the Cls. The coefficient to balance the Cls must go on the HCl because if the coefficient goes on the POCl3 then the Ps will no longer be balanced. PCl 5 + H 2 O POCl 3 + 2HCl Everything is now balanced. ZUMDAHL 5 TH EDITION CHEM 161-2002 RECITATION 4 TH WEEK CHAPTER 3 - STOICHIOMETRY BALANCING CHEMICAL REACTIONS 3-83 Balance the following equations representing combustion reactions: a. C 12 H 22 O 11(s) + O 2(g) CO 2(g) + H 2 O (g) a. C 12 H 22 O 11(s) + 12O 2(g) 12CO 2(g) + 11H 2 O (g) b. C 6 H 6(l) + O 2(g) CO 2(g) + H 2 O (g) b. C 6 H 6(l) + (15/2)O 2(g) 6CO 2(g) + 3H 2 O (g) b. 2C 6 H 6(l) + 15O 2(g) 12CO 2(g) + 6H 2 O (g) c. 2Fe (s) + (3/2)O 2(g) Fe 2 O 3(s) c. 4Fe (s) + 3O 2(g) 2Fe 2 O 3(s) d. C 4 H 10(g) + O 2(g) CO 2(g) + H 2 O (g) d. C 4 H 10(g) + (13/2)O 2(g) 4CO 2(g) + 5H 2 O (g) d. 2C 4 H 10(g) + 13O 2(g) 8CO 2(g) + 10H 2 O (g) e. FeO (s) + O 2(g) Fe 2 O 3(s) e. 2FeO (s) + (1/2)O 2(g) Fe 2 O 3(s) e. 4FeO (s) + O 2(g) 2Fe 2 O 3(s) CHEM 161-1999 FINAL EXAM + ANSWERS CHAPTER 3 - STOICHIOMETRY BALANCING CHEMICAL EQUATIONS 3. When the following equation is balanced using the smallest integers, the coefficient of BCl 3 is: BCl 3 + P 4 + H 2-> BP + HCl A. 1 B. 2 C. 3 D...
View Full Document

Page1 / 78

#Chem 161-2007 Chapter 3B-Stoichiometry practice problems -...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online