For the reaction S2O82 (aq) + 3 I(aq) --> ? 2 SO4^-2(aq) + I3^-(aq), the following data were collected at a particular temperature:
Experiment [S2O8^-2] [I^-] Initial Rate (M/s) of disappearance of S2O82
1 0.054 0.048 1.6 x 10^-5
2 0.054 0.019 6.3 x 10^-6
3 0.030 0.030 5.5 x 10^-6
Determine a) the complete rate law showing the order with respect to each reactant and the rate constant with proper units b) the overall reaction order and c) the rate of disappearance of I when [S2O8^-2] = 0.075 M and [I^-] = 0.060 M (hint: you should get around 6.2 x 103 for the rate constant value)
Careful with Part c: the rate law gives disappearance of S2O8^-2 but the question asks for the rate of disappearance of I?
an added question:
For a hypothetical gas-phase reaction that is second order in A and third order in B, by what factor does the rate change if pA is decreased by 4 times and pB is doubled?
