For each pair, choose the compound with the larger lattice energy, and the compound with the larger lattice energy is SrO.
Given the compounds BaO and SrO
in the given compound the anion is the same (O^2-) Therefore the comparison is done on the basis of cation (Ba^2+ and Sr^2+)
Since the lattice energy of an ionic compound is inversely proportional to the radius of the ions. The size of Ba^2+ ion is greater than the size of Sr^2+ ion as an atomic number of barium is greater than that of strontium.
Thus the compound with higher value of lattice energy is SrO.
What is lattice energy?
The energy needed to transform one mole of an ionic solid into gaseous ionic components is known as lattice energy. The energy that must be provided to one mole of an ionic crystal in order for it to undergo an endothermic process that separates it into gaseous ions can also be used to characterize it.
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