QJEEM12Ch7fd3: JEE Main 2012 Chemistry - Class 12 JEEM12Ch7fd3 Solution: For a first order reaction, (A) products, the concentration of…

Question

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For a first order reaction, (A)

\to

products, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is :

Accepted Answer

For a first order reaction

k = {{2.0303} \over t}\,\log \,{a \over {a - x}}

= {{2.303} \over {40}}\log {{0.1} \over {0.025}}

= {{2.303} \over {40}}\log 4

= {{2.303 \times 0.6020} \over {40}}

= 3.47 \times {10^{ - 2}}

R = K{\left( A \right)^1} = 3.47 \times {10^{ - 2}} \times 0.01

= 3.47 \times {10^{ - 4}}

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