Identify the name of the enthalpy change for each reaction. Reaction Step 1: Step 2: Step 3: M(g)->M^(+)(g)+e^(-) Step 4: x(g)+e^(-)->x^(-)(g) Step 5: ,M^(+)(g)+x^(-)(g)->Mx(s) Enthalpy enthalpy of sublimation (enthalpy of atomization)
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Identify the name of the enthalpy change for each reaction.
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The steps of the Born-Haber cycle are shown for the ionic compound MX2, made up of generic metal M and generic, gaseous halogen X. Identify the overall reaction and identify the name of the enthalpy change for each reaction. Identify the overall reaction. M(s) + 2X(g) → MX2(s) M(s) + X2(g) → MX2(s) M2+(g) + 2X-(g) → MX2(s) Reaction Enthalpy Step 1: M(s) → M(g) Step 2: X2(g) → 2X(g) Step 3: M(g) → M2+(g) + 2e- Step 4: 2X(g) + 2e- → 2X-(g) Step 5: M2+(g) + 2X-(g) → MX2(s) overall reaction Answer Bank 1st + 2nd ionization energies 2nd ionization energy bond energy of X-X 2 x electron affinity electron affinity lattice energy enthalpy of formation of MX2 -lattice energy 1st ionization energy
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Consider an ionic compound MX2 where M is a metal that forms a cation of +2 charge, and X is a nonmetal that forms an anion of -1 charge. A Born-Haber cycle for MX2 is on the right. Each step in this cycle has been assigned a number (1-7). a) Which step (1-7) represents ΔHsublimation? b) Which step (1-7) represents ΔHf? c) Which steps (1-7) are endothermic, as written? d) Step 2 represents ; step 7 represents . e) Use the following energy values to calculate the lattice energy (in kJ/mol) for MX2. ΔH°sub = 296 kJ/mol ΔH°f = - 421 kJ/mol IE1 = 378 kJ/mol IE2 = 555 kJ/mol bond energy = 310 kJ/mol EA = - 427 kJ/mol
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