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Determine the value of the equilibrium constant, K goal, for the reaction N2(g)+

ID: 939042 • Letter: D

Question

Determine the value of the equilibrium constant, Kgoal, for the reaction

N2(g)+H2O(g)NO(g)+12N2H4(g),    Kgoal=?

by making use of the following information:

Express your answer numerically.

part b

Determine the equilibrium constant, Kgoal, for the reaction

4PCl5(g)P4(s)+10Cl2(g),    Kgoal=?

by making use of the following information:

P4(s)+6Cl2(g)4PCl3(g),       K1=2.00×1019

PCl5(g)PCl3(g)+Cl2(g),       K2=1.13×102

Express your answer numerically.

1. N2(g)+O2(g)2NO(g),       K1 = 4.10×1031 2. N2(g)+2H2(g)N2H4(g),       K2 = 7.40×1026 3. 2H2O(g)2H2(g)+O2(g),       K3 = 1.06×1010

Explanation / Answer

1) eq(1) + eq(2) + eq(3) gives

2N2 + 2H2O ---> 2NO + N2H4 ,   K = K1 x K2 x K3 = 3.2 x 10^ -66

when reaction is halved we get our required equation Kgoal = K^ 1/2 = ( 3.2x10^-66)^1/2 = 1.79 x 10^ -33

2) 4eq(2) - eq (1) gives

4PCl45 <--> P4 (s) + 10Cl2 ( g)

K = k2^4 / k1   = ( 1.13x10^-2)^4 / ( 2x10^19) = 8.15 x 10^ -28

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