www-awh.aleks.com ALEKS Mahabuba Lovely Learn Suppose A 250.mL Flask Is Filled W

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www-awh.aleks.com ALEKS Mahabuba Lovely Learn Suppose A 250.mL Flask Is Filled With 0.30mol Of IN.... -Calculating An Equilibrium Constant From A P O KINETICS AND EQUILIBRIUM Calculating equilibrium composition from an equilibrium.. Suppose a 250. mL flask is filled with 0.50 mol of N2 and 0.80 mol of NO. The following reaction becomes possible: N2()+O2 2NO(g) The equilibrium constant K for this reaction is 4.51 at the temperature of the flask. Calculate the equilibrium molarity of O2. Round your answer to two decimal places

Explanation / Answer

Answer

[O2] = 0.4643M

Explanation

N2(g) + O2(g) <-------> 2NO(g)

K = [NO]2/[N2][O2]= 4.51

Initial concentration

[N2] = (0.50mol/250ml)×1000ml = 2M

[O2] = 0

[NO] = (0.80mol/250ml)×1000ml = 3.2M

Change in concentration

[N2] = - x

[O2] = - x

[NO] = +2x

Equillibrium concentration

[N2] = 2 - x

[O2] = - x

[NO] = 3.2 + 2x

Therefore,

( 3.2 + 2x)2/ ((2 - x)(-x)) = 4.51

solving for x

x = - 0.4643

Therefore, at equillibrium

[N2] = 2-(-0.4643) = 2.4643M

[O2] = - (-0.4643) = 0.4643M

[NO] = 3.2 + (2 × - 0.4643))=2.2714M

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