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# Өнеркәсіптік тепе-теңдік. Тепе-теңдік константасы Kc. Химия, 10 сынып, дидактикалық материал.

Topic: Equilibrium HL

Calculating equilibrium concentration Kc

General reaction: aA + bB ⇌ eE + fF

At equilibrium:

Kc = [E]e [F]f If Kc >> 1 the forward reaction is favoured

[A]a [B]b If Kc << 1 the backward reaction is favoured

Therefore, to find Kc only the equilibrium concentrations of the reactants and products can be used.

Steps involving both reactants and products:

• Molar ratio (from the reaction equation)
• Initial moles/mol
• Equilibrium moles/mol (decreasing reactants and increasing products from initial moles or using the formula moles = equilibrium concentration x volume given in Q
• Equilibrium concentration/mol dm-3

Question 1

4.00 mol of HI(g) was admitted to an evacuated 2.00 dm3 reaction vessel and allowed to reach equilibrium at a constant temperature, according to the equation:

2HI(g) ⇌ H2(g) + I2(g)

At equilibrium, 0.250 mol of I2 had formed.

• Determine the equilibrium concentration of all species at this temperature
• Calculate the equilibrium constant for the reaction

a)

HIH2I2

Molar ratio

Initial moles

Equilibrium moles

Equilibrium concentration

b) Kc =

Question 2

1.800 mol of ammonia is introduced into an evacuated 5.00 dm3 vessel and allowed to come to equilibrium. The concentration of nitrogen at equilibrium was determined to be 0.0435 mol dm-3. Calculate the equilibrium constant for the reaction shown, given that the temperature remained constant throughout.

2NH3(g) ⇌ N2(g) + 3H2(g)

NH3N2H2

Molar ratio

Initial moles нач моль 1,800

Equilibrium moles равн моль

Equilibrium concentration 0,0435

Kc =

Question 3

1.50 mol of carbon monoxide and 0.500 mol of chlorine gas are introduced into an evacuated 10.0 dm3 vessel at 700 K. When the reaction reaches equilibrium, the concentration of phosgene (COCl2) is 0.0485 mol dm3. Calculate the equilibrium constant for the reaction at this temperature. The reaction equation is:

CO(g) + CL2(g) ⇌ COCl2(g)

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