A plot of versus for the homogeneous reaction at is described as a straight line…

CHEMISTRY · Multi-part · A Level · Chemistry · Rate equations · Rate equations

Problem

A plot of log⁡(rate)\log(\text{rate}) versus log⁡([B]0)\log([B]_0) for the homogeneous reaction B (aq)→productsB\,(aq) \to \text{products} at 298 K298\,\text{K} is described as a straight line passing through the points (−1.00, 2.08)(-1.00,\,2.08) and (0.301, 0.00)(0.301,\,0.00) where both coordinates are expressed in base 1010 logarithms. (a) Using the two points provided, calculate the slope of the line and hence determine the order of the reaction with respect to BB. (b) The initial rate measured at [B]0=0.200 M[B]_0 = 0.200\,\text{M} is 6.6×10−6 M s−16.6\times10^{-6}\,\text{M s}^{-1}. Predict the initial rate when [B]0=0.300 M[B]_0 = 0.300\,\text{M}, expressing your answer to two significant figures. (c) Briefly comment on why a non-integer reaction order, such as the one obtained in part (a), is acceptable in chemical kinetics.

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