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

Options

A. 1.2 atm
B. 2.4 atm
C. 2.0 atm
D. 1.0 atm