Why do we have to balance equations with respect to mass?

Answer 1

You have not given a specific example, BUT EVERY CHEMICAL REACTION CONSERVES MASS.

This is why teachers insist that equations be stoichiometrically balanced. If we start with #10# #g# of reactant from ALL sources, AT MOST, we can get #10# #g# of product. In practice, we are not even going to get that, because loss will inevitably occur upon handling.

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Answer 2

Kai Bowman

We balance equations with respect to mass to ensure that the law of conservation of mass is upheld, meaning that mass is neither created nor destroyed in a chemical reaction.

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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.