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Factors Affecting the Rate of a Chemical Reaction

For the eleme...

Question

For the elementary reaction $2 A \to C$ the concentration of $A$ after 30 minutes was found to be 0.01 mole/lit. if the rate constant of the reaction is $2.5 \times 10^{- 2}$ lit mole ${s e c}^{- 1}$ the rate of the reaction at 30 minutes is:

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Solution

For given elementary reaction, rate= $K [A]^{2}$
At $30$ minutes, $[A] = 10^{- 2}$ and $K = 2.5 \times 10^{- 2} l i t m o l^{- 1} s e c^{- 1}$
$∴$ Rate= $2.5 \times 10^{- 2} \times (10^{- 2})^{2}$
$= 2.5 \times 10^{- 6} s e c^{- 1}$

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