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Elementary and Complex Reactions

For the react...

Question

For the reaction
${2 N H}_{3} \to N_{2} + {3 H}_{2}$
a curve is plotted between $[{N H}_{3}]$ is time as shown
Calculate the
(A) Rate of disappearance between 5 and 10 sec
(B) Rate of disappearance between 10 and 20 sec

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Solution

Rate of disappeareance=- $d [N H_{3}]$ / $d t$
$(A)$ , rate of disappeareance=- $\frac{0.4 - 0.6}{10 - 5}$
$∴$ Rate of disappeareance= $0.04 m o l l i t e r^{- 1} s e c^{- 1}$
$(B)$ , rate of disappeareance=- $\frac{0.2 - 0.4}{20 - 10}$
$∴$ Rate of disappeareance= $0.02 m o l l i t e r^{- 1} s e c^{- 1}$

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