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  4. Calculate the energy needed to convert three moles of sodium atoms in the gaseous state to sodium ions. The ionization energy of sodium is 495 kJ mol-1:

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Q. Calculate the energy needed to convert three moles of sodium atoms in the gaseous state to sodium ions. The ionization energy of sodium is $495\, kJ\, mol^{-1}:$

VITEEEVITEEE 2019

Solution:

Energy needed to convert 1 mole of sodium $(g)$ to sodium ions $= 495\, kJ$
$\therefore $ Energy needed to convert 3 moles of $Na\left(g\right)$ to $Na^{+}$ ions $=495\times3=1485\,kJ$