The standard enthalpy of atomization of an element is the energyrequired to conv

Question

The standard enthalpy of atomization of an element is the energyrequired to convert 1 mole of an element in its most stable form at25 centigrade to 1 mole of monatomic gas. Given that the standardenthalpy of atomization for sodium is 108.4 kJ mol-1,calculate the energy in kilojoules required to convert 1 mole ofsodium metal at 25 centigrade to 1 mole of gaseous Na+ions.

Explanation / Answer

Ionization energy of Na = 495.8 kJmol-1       for Na(g)=> Na(g)+   + e- Na(s) =>  Na(g)                             delH = 108.4 kJ/mol Na(g) => Na(g)+   +e-                   delH = 495.8 kJ/mol ------------------------------------------------------------ Na(s) => Na(g)+   +  e-                delH = 108.4 + 495.8 = 604.2 kJ/mol

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