The reaction (CH3)3CBr 1 OH2 88n (CH3)3COH 1 Br2 in a certain solvent is first order with respect to (CH3)3CBr and zero order with respect to OH2. In several experiments the rate constant k was determined at different temperatures. A plot of ln(k) versus 1/T was constructed that resulted in a straight line with a slope of 21.10 3 104 K and a y intercept of 33.5. Assume that k has units of s21. a. Determine the activation energy for this reaction. b. Determine the value of the frequency factor A. c. Calculate the value of k at 258C.

Section 1.5 - Uncertainty in Measurement two kinds of numbers in scientific work exact ex. - 12/ dozen, 1000g/1kg, 2.5cm/1 in. inexact numbers obtained by measurement instrument limitations and human error accuracy - how close to the true value precision - consistency in answers Significant Figures o the number of significant figures in any number can be determined using the following guidelines any digit that is not zero is significant