One isotope differs from another in the number of neutrons they have.
Answer:

Explanation:
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In this case, for the given reactants we identify the following chemical reaction:

Thus, we evidence a 1:1 molar ratio between KOH and HCl, therefore, for the complete neutralization we have equal number of moles, that in terms of molarities and volumes become:

Hence, we compute the volume of HCl as shown below:

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They are all transioning in states of matter
the heat of reaction for a chemical reaction
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