The half-life for the second-order decomposition of HI is 15.4 s when the initia
ID: 478645 • Letter: T
Question
The half-life for the second-order decomposition of HI is 15.4 s when the initial concentration of HI is 0.67 M. What is the rate constant for this reaction? 1.0 times 10^-2 M^-1 s^-1 4.5 times 10^-2 M^-1 s^-1 9.7 times 10^-2 M^-1 s^-1 2.2 times 10^-2 M^-1 s^-1 3.8 times 10^-2 M^-1 s^-1 What would be next half-life for the second order reaction described above? 15.4 s 30.8 s 7.70 s 25.5 s Use the following graph to answer the next two questions; assume that the solubility is reported in grams per 100 grams of H_2 O. You need to select a substance that is most likely to be a gas. Which one is it? How many grams of substance A would be found in 25 grams of water at 70^degree C? 13 g 25 g 50 g 20g What is the freezing point of a solution of 7.15 g MgCl_2 in 100 g of water? K_f for water is 1.86^degree C/m. -0.140^degree C - 1.40^degree C -2.80^degree C -4.18^degree CExplanation / Answer
22) for second order reaction
K = 1 / [A0]t1/2
K = 1 / (0.67) x 15.4
K = 1/ 10.318
K = 9.7 x 10-2 M-1s-1
answer = option c
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