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For the first-order reaction X products, which of the following graphs is best for determining the activation energy, Ea ? Note: 1. The best choice is the one that yields a straight line graph with the slope directly proportional to Ea. 2. In the options below, T is the kelvin temperature and t is time. Rate versus t k versus 1/T In k versus 1/T In k versus t ln[X] versus t [X] versus t 1/[X] versus t [X]2 versus t In k versus T A reaction has a first order rate constant of 6.29105s1 at 25C and 0.00164s1 at 79C. What is the value of the rate constant at 57C ? Enter your answer in units of s1, accurate to three significant figures. Do not include units as part of your answer. For example, enter 1.23103 as 1.23e3