In the reaction:        2A       ⇆                B       +      3C            For the reaction,   ΔH = -23 kcal/mol   and Keq =  26 X 10 -26   Is the reaction exothermic or endothermic?     Are products or reactants favored?     Using Le Chatelier’s Principle, what happens to the equilibrium if the concentration of C is increased?     Using Le Chatelier’s Principle, what happens to the equilibrium if the concentration of A is increased?

On the basis of Kc for the following reaction, would you expect the reaction to go almost completely to product at equilibrium? N2(g) + 2O2(g)  ↔ 2NO(g);     Kc = 3x10-17 yes or no

Consider the following reversible reaction at equilibrium: C6H12O6(aq) + 6 O2(g)      6 CO2(g) + 6 H2O(l). Given that this reaction is exothermic, if heat is added to the equilibrium system, how is the stress relieved?

Fill in the blank for the reaction

Acetaldehyde (CH3CHO) is an important chemical both industrially and biologically.  For instance, it is a (somewhat toxic) intermediate in the body's metabolism of ethanol into acetic acid, and thus is possibly implicated in the "hungover" symptoms of someone who has had too much to drink the night before.  In aqueous solution, it establishes an equilibrium with a hydrated form, shown below. CH3CHO (aq)   +   H2O (l)   <-->  CH3CH(OH)2 (aq) You start with an aqueous sample, already at equilibrium, with the CH3CH(OH)2 (the hydrated form) at a concentration of 2.60 M.  You have no information about how much, if any, of the anhydrous form (CH3CHO) is initially in the flask.  If you add 2.0 M of CH3CHO to the reaction flask, and as the equilibrium is being restored the amount of CH3CH(OH)2 changes by 1.13 M, what is the final amount of CH3CHO?

After equilibrium is reached in the reaction of 6.30 g H2 with 150. g I2, analysis shows that the 1.00 L flask contains 64.0 g of HI. How many moles of H2, I2, and HI are present in this equilibrium mixture? What is the Keq for this reaction?

Consider a reaction A21g2 + B21g2 ∆ 2 AB1g2, with atoms of A shown in red in the diagram and atoms of B shown in blue. (a) If Kc = 1, which box represents the system at equilibrium?