What is the lattice enthalpy for the formation of MgCl2?

What is the lattice enthalpy for the formation of ${MgCl}_{2}$ ?

A
$- 20 kJ$
B
$- 40 kJ$
C
$- 15 kJ$
D
$+ 40 kJ$

Solution:

The change in enthalpy associated with the formation of one mole of an ionic compound from its gaseous state and standard conditions.

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