Question

The data in the following table were measured at 0°C. Experiment123456[H2SeO3]0(M)1.00×10–42.00×10–43.00×10–43.00×10–43.00×10–42.00×10–4[H+]0(M)2.00×10–22.00×10–24.00×10–28.00×10–28.00×10–22.00×10–2[I–]0(M)3.00×10–23.00×10–23.00×10–23.00×10–26.00×10–26.00×10–2Initial Rate [mol/(L ⋅ s)]5.30×10–71.06×10–66.36×10–62.54×10–52.04×10–48.48×10–6 What is the reaction order with respect to H2SeO3(aq)? Select one: a. 0 b. 1 c. 2 d. 3 e. 1/2

Answer 1

From Experiments 1 and 2, it is evident that on doubling the concentration of H2SeO3 while maintaining the initial concentration of H+ and I- constant the enhancement the rate of the reaction by a factor of 2 ( from 5.3 x 10^-7 to 1.06 x 10^-6 )

So the reaction is first order with respect to H2SeO3

also on tripling the concentration of H2SeO3 while keeping the initial concentration of H+ and I- constant will increase the rate of the reaction by a factor of 3