In a pseudo first order hydrolysis of ester in water,the following results were obtained:
$t \ (s)$ $0$ $30$ $60$ $90$
$[\text{Ester}] \ (mol \ L^{-1})$ $0.55$ $0.31$ $0.17$ $0.085$

What will be the average rate of reaction between the time interval $30 \ s$ to $60 \ s$?

  • A
    $1.91 \times 10^{-2} \ s^{-1}$
  • B
    $4.67 \times 10^{-3} \ mol \ L^{-1} \ s^{-1}$
  • C
    $1.98 \times 10^{-3} \ s^{-1}$
  • D
    $2.07 \times 10^{-2} \ s^{-1}$

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In the following reaction $3A \to B + 2C$,the initial concentration of $A$ is $8\,mol\,L^{-1}$. After $10\,min$,it becomes $5\,mol\,L^{-1}$. Find the rate of reaction in $mol\,L^{-1}\,min^{-1}$.

Explain why the average rate of reaction decreases with the concentration of the reactant using an example.

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For the reaction $2N_2O_{5(g)} \to 4NO_{2(g)} + O_{2(g)}$,what is the ratio of the rate of decomposition of $N_2O_5$ to the rate of formation of $NO_2$?

For the reaction $2N_2O_5 \rightarrow 4NO_2 + O_2$,if the concentration of $NO_2$ increases by $1.6 \times 10^{-2} \ M$ in $4 \ seconds$,what is the rate of formation of $NO_2$?

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