Some measurements of the initial rate of a certain reaction are given in the table below.N2 H2 initial rate of reaction0.415M 1.92M /0.258Ms0.103M 1.92M /0.0159Ms0.415M 6.45M /0.867MsUse this information to write a rate law for this reaction, and calculate the value of the rate constant k.Round your value for the rate constant to 2 significant digits. Also be sure your answer has the correct unit symbol.
Question
Some measurements of the initial rate of a certain reaction are given in the table below.N2 H2 initial rate of reaction0.415M 1.92M /0.258Ms0.103M 1.92M /0.0159Ms0.415M 6.45M /0.867MsUse this information to write a rate law for this reaction, and calculate the value of the rate constant k.Round your value for the rate constant to 2 significant digits. Also be sure your answer has the correct unit symbol.
Solution
Para determinar la ley de velocidad y la constante de velocidad , primero necesitamos analizar cómo la velocidad inicial de la reacción depende de las concentraciones de y .
La ley de velocidad general para esta reacción puede escribirse como:
Donde y son los órdenes de reacción respecto a y , respectivamente.
Paso 1: Determinar el orden respecto a
Comparando los experimentos 1 y 2, donde la concentración de es constante:
Resolviendo para :
Paso 2: Determinar el orden respecto a
Comparando los experimentos 1 y 3, donde la concentración de es constante:
Resolviendo para :
Paso 3: Determinar la constante de velocidad
Usamos los valores de y y cualquier conjunto de datos para calcular . Usaremos el primer conjunto de datos:
Resumen
La ley de velocidad para la reacción es:
Y la constante de velocidad es:
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