28. Calculate the time during which the maximum concentration of the target product R is reached in the sequential reaction A→R→S. Rate constants k1 = 2 s-1 and k2=5 s-1, at the beginning of the reaction with rate constants СA0 = 1 kmol/m3. CS0= and CR0 ¬= 0. In this case, what will be the degree of conversion of substance A and the selectivity for the product R?

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