What is the difference between molecular weight and formula weight?

Answer 1

It is imperfect to define molecular weight for the substance having no molecular entity as in the case of purely ionic compound like NaCl. So Formula weight is more perfect for it.

The term formula weight should be used for compounds that do not exist as individual molecules, such as sodium chloride, as there is no such thing as a sodium chloride molecule. On the other hand, the term molecular weight should be used for compounds that do exist as individual molecules, such as water, carbon dioxide, etc.

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Answer 2

Jeremiah Adams

Molecular weight refers to the sum of the atomic weights of the atoms in a molecule, while formula weight refers to the sum of the atomic weights of the atoms in a chemical formula, which may represent a molecule or an ionic compound. Formula weight is used for substances that do not exist as discrete molecules, such as ionic compounds.

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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.