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The reaction 2HI → H2 + I2 is second order in [HI] and second order overall....

The reaction 2HI → H2 + I2 is second order in [HI] and second order overall. The rate constant of the reaction at 700°C is 1.57 × 10−5 M −1s−1. Suppose you have a sample in which the concentration of HI is 0.75 M. What was the concentration of HI 8 hours earlier?

A) 0.45 M
B) 0.75 M
C) 2.3 M
D) 1.9 M
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Answer #1

2HI 4 + I, second order in [HI] rate constant, k = 1.57x105 Ms-1 (H1] = 0.75M t=shours = 8X60X 60 sec for a 2nd order reacti

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