One mole of N(2)O(4)(g) at 300 K is kept...

One mole of `N_(2)O_(4)(g)` at 300 K is kept in a closed container under one atmosphere. It is heated to 600K when 20% by mass of `N_(2)O_(4)`(g) decomposes to `NO_(2)`(g). The resultant pressure is:

1.2 atm

2.4 atm

2.0 atm

1.0 atm

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