A Sealed Tube Containing an Equilibrium Mixture of NO₂(g) (Brown) $\Delta$

question 52

Multiple Choice

A sealed tube containing an equilibrium mixture of NO₂(g) (brown) and N₂O₄(g) (colorless) is subjected to a variety of temperatures.For the equilibrium reaction shown, the values of the $\Delta$ H $\degree$ and $\Delta$ S $\degree$ are also shown.What is observed in the tube with increasing temperature?
2 NO₂ (g) ⇄ N₂O₄ (g) $\Delta$ H $\degree$ =-58.02 kJ/mol, $\Delta$ S $\degree$ =-176.5 J/mol · K

• A)At higher temperatures, the gas in the tube has a darker brown color.
• B)At higher temperatures, the gas in the tube has a lighter brown color.
• C)At higher temperatures, the gas in the tube is colorless.
• D)The color does not change with temperature.
• E)At higher temperatures, the gas turns green.

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