Question
Chemistry Question on Enthalpy change
The first ionization enthalpy of Na, Mg and Si, respectively, are : 496, 737 and 786 kJ mol-1. The first ionization enthalpy (kJ mol-1) of Al is:
A
487
B
768
C
577
D
856
Answer
577
Explanation
Solution
The initial ionization enthalpy of aluminum (Al) is higher than that of sodium (Na) but lower than that of silicon (Si) and magnesium (Mg).
Thus, first ionisation enthalpy of Al would be 577 kJ/mole.
So, the correct option is (C): 577