The lattice energy of MgCl2 is the energy change for which one of the following processes?
a. Mg(s) + Cl2(g) → MgCl2(s)
b. Mg(g) + 2Cl(g) → MgCl2(s)
c. Mg2+(s) + 2Cl−(g) → MgCl2(g)
d. Mg2+(g) + 2Cl−(g) → MgCl2(s)
e. MgCl2(aq) → MgCl2(s)
Lattice energy can be defined as
energy required to convert one mole of ionic solid into its gaseous
ionic constituents. Or in opposite way it can be defined as amount
of energy released when an ionic solid is formed from its gaseous
So lattice energy for MgCl2 is given by
Mg2+(g) + 2Cl-(g) --> MgCl2(s)
So option D is correct
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