No2g has a reddish color n2o4g is colorless in an...

NO2(g) has a reddish color. N2O4(g) is colorless. In an equilibrium mixture of these two gases, the following reaction occurs: 2 NO2(g)= N2O4(g) When a reddish-colored sample of this mixture is cooled, the color fades. From this observation, can we conclude that Keq for the reaction decreases as the temperature decreases? Question 6Select one: a. yes b. no

6. 2NO2(g) ⇌ N2O4(g) Brown Colorless A sample of pure NO2(g) in a sealed tube at 20°C is placed in a temperature bath at 30°C. Observations of changes in the color, pressure, and mass of the mixture are recorded as a function of time. Which of the following is an observation that would best support the claim that the reaction represented above has reached equilibrium at 30°C? a. The total mass of the system remains constant because at equilibrium the amounts of reactant and product do not change with time. b. The color of the system changes from brown to completely colorless because at equilibrium only the product will be present. c. The total pressure of the system decreases then reaches a constant value because at equilibrium the amounts of reactant and product no longer change. d. The temperature of the system remains constant because at equilibrium the temperature must be constant.

Madhur L.

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