5H.3 7th edition

[Katie Frei 1L]

Does anyone know why for problem 5H.3 of the 7th edition of the textbook, the answer is the result of multiplying the two equilibrium constants of two chemical equations from the table 5G.2? I am confused why in order to find K of the chemical equation given, I would multiply the K's of the other two chemical equations. Thank you!

[Anusha 1H]

it helps if you write out the K values for all of the equations

2BrCl >>> Br2 + Cl2
H2 +Cl2 >>> 2HCl
-----------------------
2BrCl + H2 >>> Br2 + 2HCl

K1 = [Br2][Cl2]/[BrCl]^2
K2 = [HCl]^2/[H2][Cl2]


K3 = [Br2][HCl]^2/[H2][BrCl]^2 = K1 x K2


Hope this helps!

[Katie Frei 1L]

it helps if you write out the K values for all of the equations

2BrCl >>> Br2 + Cl2
H2 +Cl2 >>> 2HCl
-----------------------
2BrCl + H2 >>> Br2 + 2HCl

K1 = [Br2][Cl2]/[BrCl]^2
K2 = [HCl]^2/[H2][Cl2]


K3 = [Br2][HCl]^2/[H2][BrCl]^2 = K1 x K2


Hope this helps!

Thank you so much, your explanation really helps!