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What is the molecularity of magnesium oxide; would you expect its melting point to be high?

Answer 1

Magenesium oxide is non-molecular, and held together by strong electrostatic bonds between ions with more than a unit charge.

#Mg^(2+)# and #O^(2-)# are held together in a non-molecular, infinite array, and bound by strong electrostatic forces that operate between oppositely charged ions across the lattice. The melting point of this species would be exceptionally high.

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Answer 2

Wyatt Adkins

With one magnesium atom (Mg) and one oxygen atom (O), magnesium oxide has a molecularity of two. Because of the strong ionic bonds that hold the magnesium and oxygen atoms together, magnesium oxide has a relatively high melting point.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.