We are being asked to calculate the equilibrium CoBr2 of the three gases in the following reaction:
COBr2(g) ⇌ CO(g) + Br2(g) Kc = 0.190
When dealing with equilibrium and K:
• K → equilibrium units are in molarity
• K 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
We're going to calculate for the equilibrium concentrations using the following steps:
Step 1: Construct an ICE chart for the equilibrium reaction.
Step 2: Calculate the change (x) in the reaction.
Step 3: Calculate the equilibrium concentration of COBr2.
Step 4: Calculate the concentration of COBr2 when the volume of the flask was halved
1.00 moles of COBr2 were placed in a 2.00 liter flask and heated to 73 °C. At that temperature, Kc = 0.190 for the reaction COBr2(g) ⇌ CO(g) + Br2(g).
Part I: Find the equilibrium concentration of COBr2 (in M).
Part II: After equilibrium was established, the volume of the flask was halved (to 1.00 liters). Find the new equilibrium concentration of COBr2 (in M).
Answers are for Part I; Part II (in M)
A. 0.272 ; 0.648
B. 0.648; 0.324
C. 0.040; 0.080
D. 0.040; 0.020
E. 0.272; 0.544