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  4. The temperature coefficient of a reaction is 2. If the velocity of the reaction is 5 at 25°C, then, the velocity of the reaction at 55°C is

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Q. The temperature coefficient of a reaction is 2. If the velocity of the reaction is 5 at 25°C, then, the velocity of the reaction at 55°C is

COMEDKCOMEDK 2005Chemical Kinetics

Solution:

As. temperature coefficient is 2, the rate of reaction becomes double when temperature is raised by 10 degrees. Hence when temperature is increased from 25° to 55° the rate increases in steps of 10°. i.e., 3 times. Hence, rate of reaction should increase $2^3$ times i.e, 8 times. Velocity at 55°C = 5 \times 8 = 40 times