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Q.

One mole of N2O4(g) at 300K is kept in a closed container at 1 atm. It is heated to 600 K when 20% by mass of N2O4 decomposed to NO2(g). The resultant pressure is

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a

2.4 atm

b

2.0 atm

c

2.8 atm

d

1.2 atm

answer is C.

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Detailed Solution

We will have 

N2O4(g)⇌2NO2(g)

0.8mol 2×0.2mol ntotal =1.2mol

p=(1.2mol/1mol)(600K/300K)(1atm)=2.4atm

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