Question

What is the equivalent mass of $CH_3COOH$ ?

Answer 1

This question is based on our understanding of the difference between equivalent weight and atomic weight. Although atomic mass and atomic weight are not synonymous, some people use them interchangeably. Atomic weight, also known as relative atomic mass, is the ratio of a chemical element's atoms' average mass to a reference mass.

Complete answer:
In chemistry, the quantity of a material that interacts exactly with, or is equal to the combining value of, an arbitrarily fixed quantity of another substance in a given reaction is referred to as equivalent weight. Substances react in stoichiometric, or chemically equivalent, amounts with one another, and a common standard has been established. Molar mass, which is the mass of one mole of a substance, has supplanted the concept of comparable weight.
Atomic mass refers to the total number of neutrons and protons in an atom. Electrons are not counted and can be overlooked due to their small size. Dalton is the atomic mass unit. It is the standard unit for indicating the mass of an atom and is denoted as Da. The number of protons and neutrons in a given element determines the atomic mass of that element.
Atomic weight/Valency = Equivalent weight
The atomic weight is the weighted average of all the masses of a chemical element's naturally occurring isotopes. Valency is the atom's combining capacity, and atomic weight is the weighted average of all the masses of the naturally occurring isotopes. An atomic mass unit is the corresponding weight unit.

Note:
A substance's equivalent weight might change depending on the sort of response it undergoes. As a result, potassium permanganate reacting by double decomposition has an equivalent weight of 158.038 g, which is the same as its gramme molecular weight; as an oxidizing agent, it can be reduced to the manganate ion under various conditions.