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Doha

Born Haber Cycle - IB HL Chemistry

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Published in: Chemistry
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Discussing Born Haber cycle in very details with previous year Questions of IB HL

Salman F / Doha

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  1. It fo-rma--+io-w of I of t-o-vaz co-vwpo-•txeå IkJlm.«-tD LA Nqct It is the enthalpy change when I mol of an ionic compund dissociates into their gaseous ions. S A-Ava
  2. ? ? ? ? ? ? ? ? ? 0 ? ? ? ? 2 ? ? 3 ? 6 ? ? 0 tIC ? 2 ? ? ? ? ? . E ? b
  3. sq Nacl (D 14 a. cl Na+(g) + e- +Cj(g) 9nergyofNa NaCl(s) r4,x AJaC[ 1st electron affinity of a Figure 5.18 The Born—Haber cycle for NaCl. Upward arrows represent endothermic processes; downward arrows represent exothermic processes.
  4. 5.13 Draw a Born—Haber cycle for magnesium oxide and use it to work out the second electron affinity Of Enthalpy term (Mg(s)) (02(g)] first ionisation energy (Mg) second ion isation energy (Mg) first electron affinity (O) (Mg0) -S Enthalpy change / kJ mol-I 736 1450 3889 16. Which represents electron affinity? A. Al 24 (g) —y (g) + e c. D. (g) -Y 2C1(g)
  5. (d) The Bom-Haber cycle for sodium oxide is shown (not to scale). at (g) + O(g) 2Na(g) o (g) 2Na(g (g) 2Na (s) + (g) Na20 (s) enthalpy Calculate values for the following changes using section 8 of the data booklet. AH AH (Na) 1070 mol" (0) = 249kJ mov 102(g) 02-(g): The standard enthalpy Of formation Of sodium oxide is —414 kJ mol-I. Determine the lattice enthalpy of sodium oxide, in kJ mol-I, using section 8 of the data booklet and your answers to (If you did not get answers to (d)(i), use +850 kJm01-' and +600kJ mort respectively, but these are not the correct answers.) . L.q.u.. [2] 12
  6. (iii) Justify why Kao has a lower lattice enthalpy (absolute value) than Nap.

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