Question

14-1)Consider the reaction of 2NO2(g)↔N2O4(g) if the Kp for the reaction is known to be 0.480...

14-1)Consider the reaction of 2NO2(g)↔N2O4(g) if the Kp for the reaction is known to be 0.480 at 25°C, does the reaction favor product or reactant at this temperature?

14-2) For the reaction shown, Kc= 5.88 X 10-32

Ag2S(s) +2H+(aq)çè2Ag+(aq) + H2S(aq)

If we start with 2M AgNO3, and .1M H2S, 2M HNO3 , and 25.g of Ag2S in which direction will it proceed?

14-3) The reaction H3PO4(aq) + 3OH-(aq) ↔ 3H2O(l) + PO4(aq)3- is exothermic. What will happen if:

a) the system is cooled?

b) PO4(aq)3- is removed?

c) HCl is added?

d) The pressure is decreased?

e) a catalyst is added?

Homework Answers

Answer #1

(14)(1) 2NO2(g)↔N2O4(g)   

Given Kp = 0.480

We know that G = -RTln Kp

Where R = gas constant = +ve    

           T = temperature = 25oC = 298 K = +ve

So G = -RTln Kp

            = -(8.314 (298) x ln 0.480

            = +1.18x103 J

            = +1.18 kJ

Since G is +ve the reaction is non-spontaneous So the reaction favours in reactant side.

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