The reversible chemical reaction
A+BâC+D
has the following equilibrium constant:
Kc=[C][D]/[A][B]=7.5
Part A
Initially, only A and B are present, each at 2.00 M. What is the final concentration of A once equilibrium is reached?
Express your answer to two significant figures and include the appropriate units.
Part B
What is the final concentration of D at equilibrium if the initial concentrations are [A] = 1.00 M and [B] = 2.00 M ?
Express your answer to two significant figures and include the appropriate units.
2)
Learning Goal:
To determine equilibrium concentrations from initial conditions.
The reversible reaction
XY(aq)âX(aq)+Y(aq)
has a reaction quotient Qc defined as
Qc=[X][Y]/[XY]
Because the reaction is reversible, both the forward and reverse reactions will occur simultaneously. The reaction will eventually reach equilibrium, at which point the concentrations do not change, and Qc is equal to a constant known as Kc.
Calculating equilibrium concentrations when the net reaction proceeds forward
Consider mixture B, which will cause the net reaction to proceed forward.
Concentration (M)initial:change:equilibrium:[XY]0.500âx0.500âxnetââ[X]0.100+x0.100+x+[Y]0.100+x0.100+x
The change in concentration, x, is negative for the reactants because they are consumed and positive for the products because they are produced.
Part B
Based on a Kc value of 0.180 and the given data table, what are the equilibrium concentrations of XY, X, and Y, respectively?
Express the molar concentrations numerically.
Calculating equilibrium concentrations when the net reaction proceeds in reverse
Consider mixture C, which will cause the net reaction to proceed in reverse.
Concentration (M)initial:change:equilibrium:[XY]0.200+x0.200+xânetâ[X]0.300âx0.300âx+[Y]0.300âx0.300âx
The change in concentration, x, is positive for the reactants because they are produced and negative for the products because they are consumed.
Part C
Based on a Kc value of 0.180 and the data table given, what are the equilibrium concentrations of XY, X, and Y, respectively?
Express the molar concentrations numerically.
Please, provide complete explanation.