Question

For a reaction that follows the rate law of, rate = k[b]2 when [a] = 0.15 m, [b] = 0.12 m, the rate is 3.4 10−3 m s−1. what is the value and unit of rate constant k?

Answer 1

The value and unit of rate constant k are 1.61$M^{-1} S^{-1}$

The rate law of a reaction correlates the concentration of reactants with the rate of the reaction. The rate of a reaction is always proportional to the concentration of reactants. Hence, a proportionality constant (called as the rate constant) is always present in the rate law.

Rate = k $[A][B]^{2}$

Rate = k $[0.15][0.12]^{2}$

3.4×$10^{-3}$ = k 0.0021

k = 1.61$M^{-1} S^{-1}$

Therefore, the value and unit of rate constant k are 1.61$M^{-1} S^{-1}$

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