While studying the decomposition of N 2 O 5 (g), it is observed that a plot of logarithm of its partial pressure versus time is linear. What is the intercept on y axis and slope of curve ?
Text Solution
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Consider I order reaction :
Kt = 2.303 log 10 
or Kt = 2.303 log 10 a – 2.303 log 10 (a – x) …..(1)
In terms of pressure Eq. (1) may be written as,
a ∝ P 0
(a – x) ∝ P
Kt = 2.303 log 10 P 0 –2.303 log 10 P
or log 10 P = 
t + log 10 P 0
Thus, log P vs. time graph is linear with intercept equal to log P 0 and slope equal to 
.
Since, linear results are given and thus, decomposition
may be said to be of I order.
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