What is the difference between a coefﬁcient and a subscript?

Answer 1

The subscript is the amount of atoms of the element in that molecule. The coefficient tells you how many of that molecule you have.

The coefficient tells you how many molecules of that substance there is.
The subscript tells you what the substance it. It tells you the the amount of each element there are in the molecule. Changing it would change the substance itself.

Whereas simply changing the coefficient means you're changing the amount of molecules.

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Answer 2

Owen Ambrose

A coefficient is a number placed in front of a chemical formula in a chemical equation to represent the number of molecules or formula units involved in the reaction. A subscript, on the other hand, is a number written slightly below and to the right of a chemical symbol in a formula to represent the number of atoms of that element in a molecule.

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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.