# In a study of the decomposition of hydrogen iodide on a gold surface at 150 °C

Aug 1st, 2015
Sigchi4life
Category:
Chemistry
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Question description

In a study of the decomposition of hydrogen iodide on a gold surface at 150 °C

HI(g)½ H2(g) + ½ I2(g)

the following data were obtained:

 [HI], M 0.34 0.17 0.085 0.0425 seconds 0 521 781 911

Hint: It is not necessary to graph these data.

(1)
The observed half life for this reaction when the starting concentration is 0.340 M is s and when the starting concentration is 0.170 M is s.

(2)
The average rate of disappearance of HI from t = 0 s to t = 521s is  M s-1.

(3)
The average rate of disappearance of HI from t = 521s to t = 781s is  M s-1.

(4)
Based on these data, the rate constant for this  order reaction is M s-1.

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