The rate for the reaction H2(g)+Br2(g)2HBr(g) is first order in both H2 and Br2 concentrations, and the rate constant k at 288C is 6.27104Lmol1s1. Suppose 1.00L of H2 ( g ) at a concentration of 5.66102M is rapidly mixed with the same volume of Br2(g) also at a concentration of 5.66102M. Calculate the time (in seconds) required for the H2 concentration to decrease to a value of 1.74102M. (Enter your answer to three significant figures.) s