Combining Equilibrium Constants. It is possible to predict the equilibrium constant of a reaction by combining two...

4.3 Ratings (828 Votes)

N2(g)+H2O(g)â‡ŒNO(g)+1/2N2H4(g),Â Â Â Â Kgoal=?

Equation goal = 1/2(equation 1 + equation 2+ equation 3)

Kgoal = (K1 X K2 X K3 )^1/2 = (4.10 X 10^-31 X 7.40 X 10^-26 X 1.06 X 10^-10 )^1/2 = (32.16 X 10^-67)^1/2 = (3.126 X 10^-66)^1/2

= 1.77 X 10^-33

Part B:

4PCl5(g)â‡ŒP4(s)+10Cl2(g),Â Â Â Â Kgoal=?

1) P4(s)+6Cl2(g)â‡Œ4PCl3(g),Â Â Â Â Â Â Â K1=2.00Ã—10¹⁹

2) PCl5(g)â‡ŒPCl3(g)+Cl2(g),Â Â Â Â Â Â Â K2=1.13Ã—10^âˆ’2

Equation goal = 4 X equation (2) - equation (1) = 4[PCl5(g)â‡ŒPCl3(g)+Cl2(g)] - [ P4(s)+6Cl2(g)â‡Œ4PCl3(g)]

=[ 4PCl5(g)â‡Œ4PCl3(g)+4Cl2(g)]-[ P4(s)+6Cl2(g)â‡Œ4PCl3(g)] = 4PCl5(g)â‡ŒP4(s)+10Cl2(g)

Kgoal = (K2)⁴ / K1 = (1.13 X 10^-2)⁴ / 2.00Ã—10¹⁹ = 0.815 X 10^-27

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