Nitrogen dioxide can be formed from nitrogen oxide and oxygen: <?xml:namespace p

Question

Nitrogen dioxide can be formed from nitrogen oxide and oxygen: <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

2NO (g) + O2 (g) <- -> 2NO2 (g)

At 1000K, the equilibrium constant Kc is 1.20.

A system of NO,O2 and NO2 is analyzed and the following concentrations are found: [O2]=1.25M [NO]=2.25M [NO2]=3.25M

Is the system at equilibrium with respect to the reaction above? If not, will the concentration of NO2 increase, decrease, or will the system proceed to equilibrium?

Explanation / Answer

Q = [NO2]^2 / [NO]^2 [O2] = 3.25^2 / 2.25^2 1.25 = 1.669

No the system is not in equilibrium

As Q> Kc , So Product is more than reactant . So the concentration of NO2 Will decrease as it moves to equilibrium

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