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Question

M2A(g)M8Z4B(g)+αparticles
The radioactive disintegration follows first order kinetics. Starting with 1 mol of in a 1 litre closed flask at 27C, pressure set up after two half-lives is approximately

A
25 atm
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B
12 atm
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C
37 atm
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D
40 atm
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Solution

The correct option is C 37 atm
Initial P=1×0.0821×3001=24.63M2A(g)M8Z4B(g)+αparticles1 0 010.75 0.75 2×0.75=1.5
= 0.25
Total no.of moles = 0.25 + 0.75 + 1.5 = 2.5
PfPi=2.51Pf=2.5×24.63
Pressure increased = 61.57-24.63
= 37 atm




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