Question

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 $mo{l}^{-1}$:

• A. 1485 kJ
• B. 495 kJ
• C. 148.5 kJ
• D. none

Answer 1

Answer: (A)

1485 kJ

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