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Question

The decomposition NH3 gas on a heated tungsten surface gave the following results:

Initial pressure (mm)65105y185
Half-life (sec)290x670820
Calculate approximately the values of x and y.

A
x = 410 sec, y = 115 mm
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B
x = 467 sec, y = 150 mm
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C
x = 490 sec, y = 120 mm
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D
x = 430 sec, y = 105 mm
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Solution

The correct option is C x = 467 sec, y = 150 mm
t1/2 α P1n

290820=65185, Which Implies

1n=1

n=0

k=[P0]2t1/2

k=0.112 molL1 t1

x=1052×0.112 = 467 sec

y=0.112×2×670 = 150 mm

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