First slide
Periodic Trends
Question

First ionisation enthalpy of an element is 756 kJ/mole. The change in enthalpy for the process  Mg  M2+(g) will be

Moderate
Solution

Given

I.P1 of ‘M’ = + 756 kJ/mole ;

I.P2 of ‘M’ must be > 756 kJ/mole ;

Thus sum of I.P1 and I.P2 will be > 1512 kJ

Thus

Mg M2+g, H >1512 kJ ;

By inspection, the only option which is greater than 1512 kJ is Option (2) ;

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