what  actually  is  reaction  quotient?

The reaction quotient usually denoted as - Q measures the relative amount of products and reactants taking part in a reaction at a particular point in time. The reaction quotient helps in finding out in which direction a reaction is more likely to proceed, if the  pressures or the concentrations of the reactants and the products are known. The reaction quotient - Q value can be compared to K, which determines the direction of the reaction that is happening. 

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The reaction quotient (Q) measures the relative amount of products and reactants present during a reaction at a particular point in time. The reaction quotient aids in figuring out which direction a reaction is likely to proceed, given either the pressures or the concentrations of the reactants and the products.

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Definition: Reaction quotient is the ratio of the concentrations of the products of a reaction to the concentrations of the reactants.

Each concentration is raised to the power of the stoichiometric coefficient in the chemical formula.

In general, for the reaction:

aA + bB → cC + dD
The reaction quotient, Q is

Q = [C]c[D]d/[A]a[B]b

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Reaction quotient is the ratio of the initial concentrations of the products of a reaction to the initial concentrations of the reactants.

Each concentration is raised to the power of the stoichiometric coefficient in the chemical formula.

In general, for the reaction:

aA + bB → cC + dD
The reaction quotient, Q is

Q = [C]c[D]d/[A]a[B]b

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