The ionization energy of sodium is 495kJ/mol. How much energy in joules is needed to convert atoms present in 2.3 mg of sodium into sodium ions?
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Solution
Given, mass of Na atoms = 2.3 mg = 2.3×10−3 g So, number of moles of Na = 2.3×10−323=10−4mol Energy involved in ionization of 1 mole of Na atom is =495kJ/mol So, energy involved in ionization of 10−4 mol Na atom is: = 495×103×10−4 J = 49.5 J