One mole of \( \mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \) at \( 300 \mathrm{~K} \) is kept in...
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One mole of \( \mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \) at \( 300 \mathrm{~K} \) is kept in a closed container under one atm. It is heated to \( 600 \mathrm{~K} \) when \( 20 \% \) by mass of \( \mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \) decomposes to \( \mathrm{NO}_{2}(\mathrm{~g}) \). The resultant pressure is
(a) \( 1.2 \mathrm{~atm} \)
(b) \( 2.4 \mathrm{~atm} \)
(c) \( 2.0 \mathrm{~atm} \)
(d) \( 1.0 \mathrm{~atm} \)
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