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

question 94

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°_rxn and $\Delta$ S°_rxn are also shown. What is observed in the tube with increasing temperature?
2NO₂(g) $\leftrightarrows$ N₂O₄(g) $\Delta$ H $\degree$ = -58.02 kJ/mol, $\Delta$ S=-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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