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The gas phase decomposition of hydrogen peroxide at 400C H2O2(g)H2O(g)+1/2O2(g) is second order in H2O2. In one experiment, when the initial concentration of H2O2 was 0.191M, the concentration of H2O2 dropped to 4.81102M after 16.4 seconds had passed. Based on these data, the rate constant for the reaction is M1s1. The gas phase decomposition of hydrogen iodide at 700K HI(g)1/2H2(g)+1/2I2(g) is second order in HI with a rate constant of 1.20103Ms1. If the initial concentration of HI is 0.855M, the concentration of HI will be 0.245M after seconds have passed