Equilibrium Stoichiometry
Equilibrium stoichiometry is a fundamental concept in chemistry that explores the quantitative relationships between reactants and products at chemical equilibrium. It delves into the precise balance of reactants and products in a reversible reaction, considering the coefficients of the involved substances. This aspect of stoichiometry becomes crucial in understanding how a system reaches and maintains equilibrium, elucidating the equilibrium constant and aiding in predicting the direction of a reaction under different conditions. In essence, equilibrium stoichiometry provides a quantitative framework for comprehending the dynamic equilibrium state in chemical systems.
Questions
- Calculate the concentration of each species at equilibrium?
- 1. For the reaction, #PCl_(3(g))+Cl_(2(g)) rightleftharpoons PCl_(5(g))#, #K_c = 96.2 # at 400 K. If the initial concentrations are 0.22 mol/L of #PCl_3# and 0.42 mol/L of #Cl_2#, what are the equilibrium concentrations of all species?
- A mixture initially contains A, B, and C in the following concentrations: [A]=0.550 M, [B]=1.05 M, [C]=.550 M. The following reaction occurs and equilibrium is established: A+2B <-> C At equilibrium, [A]=.390 M and [C]=0.710 M. What is the value of the equilibrium constant, Kc?
- Considering H2(g) + I2(g) ↔ 2HI and a temperature of 731K; 2.40 mol of H2 and 2.40 mol of I2 are placed in a 1.00 L vessel. What is the equilibrium concentration of H2 in the gaseous mixture? The equilibrium constant is K = 49.0
- Considering the following reaction: CO(g) + 2 H2(g) --> CH3OH(g) Suppose that the initial concentrations of the reactants are [CO] = 0.500 M and [H2] = 1.00 M. Assuming that there is no product at the beginning of the reaction and that at equilibrium [CO] = 0.15 M, what is the equilibrium constant at this new temperature?
- What is #K_(eq)# for the reaction #2SO_3(g) #⇌ #2SO_2(g)# + # O_2 (g)#?
- A sample of carbon is placed in a rigid 1.50 L flask. Dinitrogen monoxide is added and the flask heated to 800C. When the system reached equilibrium the partial pressure of the carbon dioxide is found to be 0.030 atm and the partial pressure of the dinitrogen monoxide to be 1.48 atm. What will be the sign of the change in entropy, delta S, for the reaction?
- A sample of carbon is placed in a rigid 1.50 L flask. Dinitrogen monoxide is added and the flask heated to 800C. When the system reached equilibrium the partial pressure of the carbon dioxide is found to be 0.030 atm and the partial pressure of the dinitrogen monoxide to be 1.48 atm. What is the Gibbs free energy change, delta G, for the reaction at 800C?
- 3.1 mol of #sf(Fe^(3+)# is mixed with 3.2 mol of #sf(SCN^-)# and allowed to reach equilibrium, after which 3 mol of #sf([Fe(SCN)]^(2+))# is formed. What is the value of #sf(K_c)# ?
- How do you find the equilibrium constant for the reverse reaction of this problem?
- In a 10 litre evacuated chamber, 0.5 mole of H2 and 0.5 mole I2 gases are reacted to produce HI gas at 445°.the equilibrium constant at this temperature is 50. How many moles of iodine remain unreacted at equilibrium?
- How can one tell a reaction has reached equilibrium?
- At some temperature, a 100-L reaction vessel contains a mixture that is initially 1.0 mol Co and 2.0 mol H2. The vessel also contains a catalyst so that the following equilibrium is attained: CO(g) + 2H2(g) <--> CH3OH(g) At equilibrium, the mixture contains 0.100 mol CH3OH. In a later experiment in the same vessel, you start with 1.0 mol CH3OH. How much methanol is there at equilibrium?
- The dissociation of ethanoic acid is an equilibrium process which is represented by the equation: #HC_2H_3O_2 H^+ + C_2H_3O_2^-# How will this equilibrium be affected if a base (OH-) is added?
- How do you write the balanced acid equation and the dissociation expression Ka for following compounds in water? a) #H_3PO_4# b) #HClO_2# c) #CH_3COOH# d) #HCO_3^-# e) #HSO_4^-#
- How can one tell a reaction has reached equilibrium?
- What is the concentration of ammonium ion in a solution of #NH_3(aq)# that is nominally #0.157*mol*L^-1#?
- 2 moles PCl5 are heated in a 2L flask.At equilibrium 40% PCl5 dissociates . what is the equilibrium constant for this reaction?
- What is the stoichiometric equation corresponding to the equilibrium mass action expression given below?
- 1 mole nitrogen gas and 3 moles hydrogen gas form .05 moles NH3 @ equilibrium. What is Kc of the reaction?