17 2 SO 2 (g) + O 2 (g) ? 2 SO 3 (g) 2 N 2 (g) + O 2 (g) ? 2 N 2 O(g) 4 NH 3 (g)

Question

17

2 SO2(g) + O2(g) ? 2 SO3(g) 2 N2(g) + O2(g) ? 2 N2O(g) 4 NH3(g) + 3 O2(g) ? 2 N2(g) + 6 H2O(g) SO3(g) + NO(g) ? SO2(g) + NO2(g) None of the above reactions have Kc = Kp.



15

Phosphorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to the reaction:

PCl3(g)+Cl2(g)?PCl5(g)

An equilibrium mixture at 450 K contains
PPCl3 = 0.249 atm,
PCl2 = 0.315 atm, and
PPCl5 = 5.24 atm. What is the value of Kp at this temperature? Phosphorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to the reaction:



An equilibrium mixture at 450 K contains
= 0.249 atm,
= 0.315 atm, and
= 5.24 atm. What is the value of Kp at this temperature? 4.12

Explanation / Answer

(1) The answer is: SO3(g) + NO(g) <=> SO2(g) + NO2(g)

Kc = Kp when moles of gaseous reactants = moles of gaseous products

=> SO3(g) + NO(g) <=> SO2(g) + NO2(g)



(2) The answer is: 66.7

PCl3(g) + Cl2(g) <=> PCl5(g)

Kp = P(PCl5)/P(PCl3).P(Cl2)

= 5.24/(0.249 x 0.315)

= 66.7

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