Sodium chloride and magnesium oxide have exactly the same arrangements of ions in the crystal lattice, but the lattice enthalpies are very different. These tables include heat of formation data gathered from a variety of sources, including … For example, the standard enthalpy of formation of sodium oxide is NOT the same as the standard combusion enthalpy of sodium.

J. Chem. Thermodynamics 1973, 5, 485--490 The enthalpy of sodium oxide Na20 to 1300 K by drop calorimetryt D. R. FREDRICKSON and M. G. CHASANOV Chemical Engineering Division, Argonne National Laboratory Argonne, Illinois 60439, U.S.A. (Received 4 November 1972) A high-precision drop-calorimetric system has been used to measure the enthalpy (relative to 298.15 K) of Na20 in the … Beware, though as this is not always the case.

2. 2Al2O3(s) → 4Al(s) + 3O2(g) ΔH = 3352 kJ A) What is the enthalpy change for the formation of 1 mol of aluminum oxide from its elements?

All the enthalpies are at 2 The lattice energy is defined as the energy released when ions in the gaseous state form a solid. Standard Heat (Enthalpy) of Formation, Hfo, of any compound is the enthalpy change of the reaction by which it is formed from its elements, reactants and products all being in a given standard state. b) Lattice formation enthalpy is the enthalpy change when 1 mole of solid crystal is formed from its scattered gaseous ions. ∆fH° Standard molar enthalpy (heat) of formation at 298.15 K in kJ/mol ∆fG° Standard molar Gibbs energy of formation at 298.15 K in kJ/mol S° Standard molar entropy at 298.15 K in J/mol K Cp Molar heat capacity at constant pressure at 298.15 K in J/mol K The standard state pressure is 100 kPa (1 bar). I really don't understand what im suppose to do. That means that the ions are closer together in the lattice, and that increases the strength of the attractions. The lattice enthalpy of magnesium oxide is also increased relative to sodium chloride because magnesium ions are smaller than sodium ions, and oxide ions are smaller than chloride ions. B) Is the reaction exothermic or endothermic? So we want to find the change in enthalpy of the following equation, which we expect to be exothermic (negative ΔH, but lattice energy, by definition, is positive): 2 Na+(g) + O-2(g) ---> Na2O(s)

2Na (s) + ½O 2 (g) Na 2 O(s) In the above equation, one mole of sodium oxide is formed = ΔHf, but … (58) A considerable amount of heat is required for the decomposition of aluminum oxide. Note: In this diagram, and similar diagrams below, I am not interested in whether the lattice enthalpy is defined as a positive or a negative number - I am just interested in their relative sizes.

The enthalpy of solution, of sodium and sodium oxide in large volume of water, are − 1 8 4 and − 2 3 8 k J / m o l, respectively. 1: Theoretical results, average of two calculations O'Hare and Wahl, 1972, So and Richards, 1975.The relative term values of the two states are in qualitative agreement with deductions made from a magnetic deflection analysis of the reactive scattering of Na+NO 2, see Herm and Herschbach, 1970.: 2

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