Question

Which of the following statements is correct according to the Law of mass action?

• A. Under a given set of conditions, the rate of chemical reaction is directly proportional to the product of the concentration of the reacting substances
• B. For a given temperature, the rate of a reaction is directly proportional to the product of molar concentrations of reacting species, each raised to a power equal to the corresponding stoichiometric coefficient appearing in the balanced chemical equation.
• C. The Law of mass is only applicable for solids
• D. Both a and b

Answer 1

The correct option is B

For a given temperature, the rate of a reaction is directly proportional to the product of molar concentrations of reacting species, each raised to a power equal to the corresponding stoichiometric coefficient appearing in the balanced chemical equation.

According to the law of mass action, the rate of a reaction at constant temperature is directly proportional to the product of molar concentrations of reacting species, each raised to the power of corresponding stoichiometric coefficient appearing in the chemical equation.

Taking the example of the reaction $N_2$(g) + 3$H_2$(g)⇌ 2$N{H}_3$ (g)

We can write Rate of forward reaction, $r_f$ = $k_f$ ${\left[N_2\right]}^1$ ${\left[H_2\right]}^3$

And the rate of backward reaction, $r_b$ = $k_b$ ${\left[N{H}_3\right]}^2$