The ionization enthalpy of formation from is , while the electron gain enthalpy of Br is . Given the lattice enthalpy of NaBr is . The energy for the formation of NaBr ionic solid is .

Question

The ionization enthalpy of  formation from  is , while the electron gain enthalpy of Br is . Given the lattice enthalpy of NaBr is . The energy for the formation of NaBr ionic solid is   .

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Strategy:
 The formation of an ionic solid from its elemental gaseous ions is defined by the lattice enthalpy. For formation from the neutral elements, sum ionization energy, electron gain, and lattice energy.

Step 1: Sum the energy components
Process:

.

Step 2: Format result
.

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