Question

At a given temperature the gas phase reaction: N2 + O2 2NO has an equilibrium constant...

At a given temperature the gas phase reaction: N2 + O2 2NO has an equilibrium constant of4.00x10-2 . What will be the concentration of NO at equilibrium, if1.00 moles of nitrogen and 1.00 moles of oxygen are allowed to cometo equilibrium in a 250 mL flask?

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Answer #1

N2 +   O2 <------------------------> 2 NO

1         1                                         0 -----------------> initial

1-x    1-x                                       2x -------------------> equilibrium

Kc = (2x)^2 / (1-x)^2

4 x 10^-2 = (2x)^2 / (1-x)^2

4 x 10^-2 = (2x )^2 / (1-x)^2

2 x 10^-1 = 2 x / 1-x

0.2 = 2x / 1-x

2x = 0.2 -0.2 x

2.2 x =0.2

x = 0.091

NO moles = 2 x = 2 x 0.091 = 0.182 moles

NO molarity = moles / volume

                    = (0.182 / .250)

                   = 0.727 M

NO molarity= 0.727 M

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