17. The initial concentrations or pressures of reactants and products are given

Question

17. The initial concentrations or pressures of reactants and products are given for each of the following systems. Calculate the reaction quotient and determine the direction in which each system will proceed to reach equilibrium.

(a) 2NH3 (g) N2 (g) + 3H2 (g) Kc = 17; [NH3] = 0.20 M, [N2] = 1.00 M, [H2] = 1.00 M

(b) 2NH3 (g) N2 (g) + 3H2 (g) KP = 6.8 × 104 ; initial pressures: NH3 = 3.0 atm, N2 = 2.0 atm, H2 = 1.0 atm

(c) 2SO3 (g) 2SO2 (g) + O2 (g) Kc = 0.230; [SO3] = 0.00 M, [SO2] = 1.00 M, [O2] = 1.00 M

(d) 2SO3 (g) 2SO2 (g) + O2 (g) KP = 16.5; initial pressures: SO3 = 1.00 atm, SO2 = 1.00 atm, O2 = 1.00 atm

(e) 2NO(g) + Cl2 (g) 2NOCl(g) Kc = 4.6 × 104 ; [NO] = 1.00 M, [Cl2] = 1.00 M, [NOCl] = 0 M

(f) N2 (g) + O2 (g) 2NO(g) KP = 0.050; initial pressures: NO = 10.0 atm, N2 = O2 = 5 atm

Explanation / Answer

Post one more question to get the remaining three parts

a) Reaction Quotient = [N2][H2]^3/[NH3]^2

=> (1)(1)^3/(0.20)^2

=> 25

Since Reaction Quotient > Kc, hence the direction in which each system will proceed to the equilibrium, therefore the reaction will move from products to reactant

b) Reaction Quotient = [PN2][PH2]^3/[PNH3]^2

=> (2)(1)^3/(3)^2

=> 0.22 atm

Since Reaction Quotient < Kp, hence the direction in which each system will proceed to the equilibrium, therefore the reaction will move from reactant to products

c) Reaction Quotient = [O2][SO2]^2/[SO3]^2

=> Infinite, since concentration of SO3 is equal to zero

Since Reaction Quotient > Kc, hence the direction in which each system will proceed to the equilibrium, therefore the reaction will move from products to reactant

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