Based upon a consideration of lattice energies, which of the following compounds is expected to have...

Based upon a consideration of lattice energies, which of the following compounds is expected to have the highest melting point?

MgCl2

KCl

HCl

Cl2

PCl3

explanation please!

Expert Solution

Lattice energy is defined as the energy required to dissociate solids into gaseous ions.

The more ionic the compound it is said to have high lattice energy and if a compound is said to be covalent it has low lattice energy.

Similarly if the product of the charges of ion is more it has high lattice energy.

Its relationship with melting point is that if a compound has higher value of lattice energy then it is said to have high melting point.

Among the above mentioned MgCl₂ is said to have high lattice energy which means it has high melting point.

Though the product of charges of PCl₃ is higher because of its covalent nature it is said to have low lattice energy than MgCl₂.

Among the above mentioned compounds Cl₂ is said to have low lattice energy.

Though the product of charges of Cl₂ , HCl , NaCl , KCl are same Cl₂ is said to have covalent nature whereas NaCl or KCl are ionic which states that Cl2 has a lower lattice energy which means it has low melting point.

Therefore among the above mentioned compounds MgCl₂ has higher melting point and Cl₂ has low melting point.

queen_honey_blossom answered 2 years ago

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