Q28 / 120 · VITEEE 2019 · Chemistry

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

  • Correct answer
    A
    $1485 \mathrm{~kJ}$
  • B
    $495 \mathrm{~kJ}$
  • C
    $148.5 \mathrm{~kJ}$
  • D
    None

Solution

Energy needed to convert 1 mole of sodium $(\mathrm{g})$ to sodium ions $=495 \mathrm{~kJ}$ $\therefore$ Energy needed to convert 3 moles of $\mathrm{Na}(\mathrm{g})$ to $\mathrm{Na}^{+}$ions $=495 \times 3=1485 \mathrm{~kJ}$

Hence, the correct answer is option: 'A'.

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