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The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27°C to 42°C. Its energy of activation in KJ/mol is _____. (Take ln 5 = 1.6094; R = 8.314 J mol−1K−1)

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answer is 3.

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Detailed Solution

r2r1=e−E2/RT2e−E2/RT1=5ln⁡5=EaRT2−T1T1T22.303×0.6990=Ea8.31415300×315Ea=84.32 KJ

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The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27°C to 42°C. Its energy of activation in KJ/mol is _____. (Take ln 5 = 1.6094; R = 8.314 J mol−1K−1)