Step 1: 1/2 bond dissociation energy of Cl2(g) -Known (122 kJ/mol) Step 2: Enthalpy of sublimation of Na(s) - Known (107.3 kJ/mol) Step 3: Ionization energy of Na(g) - Known (496 kJ/mol) Step 4: Electron affinity of Cl(g) - Known (-349 kJ/mol) Step 5: Lattice formation energy of NaCl - Unkown Step 6: Enthalpy of formation of NaCl - Known (-411 kJ/mol)

Can explain concepts, principles, and processes by putting it their own words, teaching it to others, justifying their answers, and showing their reasoning.• Can interpret by making sense of data, text, and experience through images, analogies, stories, and models.• Can apply by effectively using and adapting what they know in new and complex contexts.• Demonstrate perspective by seeing the big picture and recognizing differ-ent points of view.• Display empathy by perceiving sensitively and walking in someone else’s shoes.• Have self-knowledge by showing meta-cognitive awareness, using productive habits of mind, and reflect-ing on the meaning of the learning and experience.