Why equilibrium state is attainable from either way ?
Why at equilibrium state r reaction mixture does not contain 50% amount of reactants and 50% amount of products?

answer:• Define chemical equilibrium in terms of a reversible reaction. (Understanding);

• Write both the forward and the reverse reaction and describe the macroscopic

characteristics of each. (Applying);

• Define Law of Mass Action. (Understanding);

• Derive an expression for the equilibrium constant and its units. (Applying);

• State the necessary condition for the equilibrium and the ways that equilibrium can be

recognized. (Understanding) and

• Write the equilibrium constant expression of a reaction.

Explanation:

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.