They will have the smallest distance between centres and will have the largest lattice energies. The smallest ions will be able to get closest to each other. ionic bonds to Mg(2+) due to the smaller ionic radius and higher charge density, thereby MgO will have a more exothermic lattice enthalpy due to the stronger ionic bonds relative to MgS. Which has higher lattice energy MgO or MgS?Īs a result, O(2-) will form stronger electrostatic attractions i.e. The lattice energy of CaO(s) is –3460 kJ/mol the lattice energy of K2O is –2240 kJ/mol. What is the lattice energy of calcium oxide? Since oxide has a -2 charge while fluoride only has a -1 charge, therefore, the compound MgO has higher lattice energy. Why does magnesium oxide have a higher lattice energy than magnesium fluoride?īetween the given ionic compounds, the difference would be on the charge of the anions. As F-ion is smallest LiF has maximum lattice energy. Smaller the size of ions, larger the magnitude of charges, more the lattice energy. This results in a stronger affinity for the negative O2- ions. Mg2+ has a smaller radius than Ca2+ and thus a higher positive charge density. Why are the lattice enthalpies of calcium oxide and magnesium oxide different?ĭifferences in size of an ionic lattice are directly linked to differences in how exothermic the lattice enthalpy of a salt is. Thus, we expect the lattice energy of CaO, which has 2+ and 2– ions, to be the greatest of the three. What is the lattice energy of magnesium oxide?īecause the product of the charges, Q1Q2, appears in the numerator of Equation 8.4, the lattice energy will increase dramatically when the charges of the ions increase. The oxygen is more likely to take electrons from magnesium than calcium, which increases the lattice energy. Why does magnesium oxide have a higher lattice energy than calcium oxide? -The charges on magnesium and oxide match up better than those on calcium and oxide. Is the lattice energy of MgO higher than calcium oxide? 8 Why is the lattice enthalpy of magnesium oxide less exothermic?.

7 How are calcium oxide and magnesium oxide enthalpies different?.4 Why does magnesium oxide have a higher lattice energy than magnesium fluoride?.2 What is the lattice energy of magnesium oxide?.1 Is the lattice energy of MgO higher than calcium oxide?.

Cao lattice energy