# Transcribed Image Text: A student obtained the following data for the gas phase decomposition of hydrogen iodide at 700 K

Transcribed Image Text: A student obtained the following data for the gas phase decomposition of hydrogen iodide at 700 K.
HI(g) % H2(g) + ½ I2(g)
[HI], M
1.29
0.645
0.323
0.162
seconds
lo
873
2.61×103
6.08×103
(1) What is the half-life for the reaction starting at t=0 s?
Is
What is the half-life for the reaction starting at t=873 s?
Does the half-life increase, decrease or remain constant as the reaction proceeds?
(2) Is the reaction zero, first, or second order?
(3) Based on these data, what is the rate constant for the reaction?
M’s-1 Transcribed Image Text: In a study of the gas phase decomposition of hydrogen iodide at 700 K
HI(g) % H2(g) + ½ I2(g)
the following data were obtained:
[HI], M
1.29
0.645
0.323
0.162
seconds
873
2.61×103
6.08×103
Hint: It is not necessary to graph these data.
(1)
The observed half life for this reaction when the starting concentration is 1.29 M is
s and when the starting concentration is 0.645 M is
(2)
The average A(1/[HI]) / At from t = 0 s to t= 873 s is
The average A(1/[HI]) / At from t= 873 s to t= 2.61×10³ s is
(3)
Based on these data, the rate constant for this
order reaction is

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