We are being asked to calculate the equilibrium concentration of X2 for the given equilibrium reaction:
H2(g) + X2(g) ⇌ 2 HX(g) Kc = 24.4 at 300 K.
When dealing with equilibrium and Kc:
• Kc → equilibrium units are in molarity
• Kc is an equilibrium expression:
▪ only aqueous and gaseous species are included in the equilibrium expression
▪ the coefficient of each compound in the reaction equation will be the exponent of the concentrations in the equilibrium expression
initial H2 = 0.150 M
initial X2 = 0.200 M
initial HX = 0.600 M
Let’s calculate the Reaction Quotient (Q) using the given initial concentration to determine which direction the equilibrium will proceed:
For the reaction system H2(g) + X2(g) ⇌ 2 HX(g)
Kc = 24.4 at 300 K. If the reaction is set up with the following initial concentrations, what will the equilibrium concentration of X2 be?
initial H2 = 0.150 M initial X2 = 0.200 M initial HX = 0.600 M
A. 0.0365 M
B. 0.114 M
C. 0.164 M
D. 0.0730 M
E. 0.500 M
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