The decompostion NH 3 gas on a heated tungsten surface gave…

Chemistry Chemical Kinetics Rate law and Rate Constant Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

The decompostion NH 3 gas on a heated tungsten surface gave the following results :

Initial pressure (mm of Hg) 65 105 y 185

Half-life (sec) 290 x 670 820

Calculate approximately the values of x and y.

x = 410 sec, y = 115 mm of Hg

x = 467 sec , y = 150 mm of Hg

x = 490 sec, y = 120 mm of Hg

x = 430 sec, y = 105 mm of Hg

Text Solution

Verified by Experts

The correct answer is:

Initial pressure 65 105 y 185

Half life 290 x 670 820

Initial pressure of gas ∝ Initial moles of gas in above question.

Half life ∝ Initial pressure

So, it must be zero order reaction

t 1/2 = = 290 = ⇒ k = = 0.112 mm of Hg/sec

x = = 468 sec 670 = ⇒ y = 150 mm of Hg

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