The decomposition of HI(g) is represented by the equation 2HI(g)⇌H2(g)+I2(g) The following experiment was devised to determine the equilibrium constant of the reaction. HI(g) is introduced into five identical 400-cm3 glass bulbs, and the five bulbs are maintained at 623 K.The amount of I2 produced over time is measured by opening each bulb and titrating the contents with 0.0150 M Na2S2O3(aq). The reaction of I2 with the titrant is I2+2Na2S2O3→Na2S4O6+2NaI

Data for the experiment are provided in this table. Bulb Initial mass of HI (g) Time (hours) Volume of titrant (mL) 1 0.300 2 20.96 2 0.320 4 27.90 3 0.315 12 32.31 4 0.406 20 41.50 5 0.280 40 28.68 In which bulb would you expect the composition of gases to be closest to equilibrium?

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