Consider the following reaction where Kc = 1.80×10-4 at 298 K NH4HS(s) NH3(g) +
ID: 541785 • Letter: C
Question
Consider the following reaction where Kc = 1.80×10-4 at 298 K
NH4HS(s) NH3(g) + H2S(g)
A reaction mixture was found to contain 5.08×10-2 moles of NH4HS(s), 8.19×10-3 moles of NH3(g), and 1.34×10-2 moles of H2S(g), in a 1.00 liter container. Is the reaction at equilibrium? If not, what direction must it run in order to reach equilibrium? The reaction quotient, Qc, equals _____.
The reaction
A. must run in the forward direction to reach equilibrium.
B. must run in the reverse direction to reach equilibrium.
C. is at equilibrium.
Explanation / Answer
since volume is 1L, number of moles will be same as concentration
Qc = [NH3][H2S]
Qc = (8.19*10^-3)*(1.34*10^-2)
Qc = 1.10*10^-4
Since Qc is less than Kc, the equilibrium will move in forward direction
Answer:
The reaction is not at equilibrium
Qc = 1.10*10^-4
A. must run in the forward direction to reach equilibrium.