One mole of N2O4(g) at 300K is kept in a closed container under 1 atomsphere. It is heated to 600K when 20% by mass of N2O4(g) decomposes to NO2(g). The resultant pressure is:
A
1.2 atm
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B
2.4 atm
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C
2 atm
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D
5 atm
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Solution
The correct option is B 2.4 atm n2O42NO210Ateq.1−0.20.40.80.4 Also initial pressure of N2O4 before dissociation increases to 2 atm on heating from 300 to 600K. P α No. of moles 2 atm α 1 mole Final pressure α Final total no. of moles(0.8+0.4=1.2) Final pressure= 2 atm × 1.2 = 2.4 atm