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A first order reaction A B requires activation energy of 70 kJ/mol. When 20% solution of A was kept at 25°C for 20 minutes, 25% decomposition took place. What will be the percent decomposition in the same time in a 30% solution maintained at 40°C? Assume that the activation energy remains constant in this range of temperature.

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Note : It does not matter whether you take 20%, 30%, 40% or 70% of A

At 25°C, 20% of A decomposes 25%

Now calculate % decomposition at 40°C using first order kinetics. 

 x = 67.1 67.1% decomposition of A at 40°C

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