Question

A.) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogen sulfide, H2S, through the reaction

NH4HS(s)⇌NH3(g)+H2S(g)

1.)This reaction has a Kp value of 0.120 at 25 ∘C.

What is the initial pressure of H2S(g) in the flask?

Express your answer numerically in atmospheres.

B.) For the reaction

aA+bB⇌cC+dD

the reaction quotient, Q, is given by the expression

Q=[C]c[D]d[A]a[B]b

under any conditions. The value of Q is equal to Konly at equilibrium.

1.) The following reaction was carried out in a 2.75 L reaction vessel at 1100 K:

C(s)+H2O(g)⇌CO(g)+H2(g)

If during the course of the reaction, the vessel is found to contain 5.50 mol of C, 15.8 mol of H2O, 3.10 mol of CO, and 7.10 mol of H2, what is the reaction quotient Q?

Enter the reaction quotient numerically.

2.)The reaction

2CH4(g)⇌C2H2(g)+3H2(g)

has an equilibrium constant of K = 0.154.

If 7.00 mol of CH4, 4.00 mol of C2H2, and 10.15 mol of H2 are added to a reaction vessel with a volume of 5.40 L , what net reaction will occur?The reaction

has an equilibrium constant of  = 0.154.

If 7.00  of , 4.00  of , and 10.15  of  are added to a reaction vessel with a volume of 5.40  , what net reaction will occur?

	The reaction will proceed to the left to establish equilibrium.
	The reaction will proceed to the right to establish equilibrium.
	No further reaction will occur because the reaction is at equilibrium.

C.)The following reaction was performed in a sealed vessel at 748 ∘C :

H2(g)+I2(g)⇌2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.45M and [I2]=2.40M. The equilibrium concentration of I2 is 0.0400 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Answer 1

The reaction quotient determines the direction of the reaction. If the quotient reaction is less than the equilibrium constant, then the reaction will proceed to the right, if it is more than the equilibrium constant, the reaction will proceed to the left. If it is equal to the constant reaction, the system is in equilibrium.

So:

  

The reaction will proceed to the left to establish equilibrium.