{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

userdata-paziras-Chem101-Chap_09A

Formacrystallinestructure netenergyreleased

Info icon This preview shows page 1. Sign up to view the full content.

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

Unformatted text preview: st Ionization Energy of Na) Step 4: Formation of Cl (Cl atoms ® Cl ions) Cl (g) + e - Cl- (g) DH4 = –349 kJ/mol Na exothermic (Electron Affinity of Cl Step 5: Formation of NaCl(s) from ions + Na (g) + Cl- (g) Na+ Cl- (s) DH5 = –786 kJ/mol Na exothermic (Lattice Energy of NaCl = U) ­energy given off when ions form a crystalline structure Net Energy Released = + 108 kJ + 120 kJ + 496 kJ – 349 kJ – 786 kJ = – 411 kJ/mol 7 Chemistry 101 + Na (g) Chapter 9 + Cl(g) E. A. of Cl (–349 kJ/mol) I. E. of Na (+ 496 kJ/mol) + Na (g) + Cl (g) Na(g) + Cl(g) Dissociation of Cl2 (+ 120 kJ/mol) Na(g) + ½ Cl2(g) Sublimation of Na (+ 108 kJ/mol) Lattice Energy (–786 kJ/mol) Na(s) + ½ Cl2(g) DHf (NaCl) ­ 411 kJ/mol 8 Chemistry 101 Chapter 9 INTERPRETING THE ENERGETICS OF IONIC BONDING + · The Net Ionic React ion of the format ion of Na Cl- (s) is exothermic: Na(s) + + Na Cl (s) ½ Cl2(g) Higher Energy Less stable DHf = ­ 411 kJ/mol Lower Energy More stable NOTE: 1. The system’s energy i...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern