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

question 79

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 H and S are also shown. What is observed in the tube with increasing temperature? 2NO₂(g) N₂O₄(g) H= -58.02 kJ/mol, 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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