Q82ptsthe reaction ag 2bg cg was allowed to come to

Q8_(2pts)_The reaction A(g) + 2B(g) C(g) was allowed to come to equilibrium. The initial
amounts of reactants placed into a 5.00 L vessel were 1.0 mol A and 1.8 mol B. After the
reaction reached equilibrium, 1.0 mol of B was found. Calculate K
c
for this reaction.
A) 0.060 B) 5.1 C) 17 D) 19 E) 25
Q9_(2pts)_If one starts with pure NO
2
(g) at a pressure of 0.500 atm, the total pressure inside
the reaction vessel when 2NO
2
(g) 2NO(g) + O
2
(g) reaches equilibrium is 0.674 atm.
Calculate the equilibrium partial pressure of NO
2
.
Q10_(2pts)_At 250ºC, the equilibrium constant K
p
for the reaction PCl
5
(g) PCl
3
(g) + Cl
2
(g)
is 1.80. Sufficient PCl
5
is put into a reaction vessel to give an initial pressure of 2.74 atm at
250ºC. Calculate the pressure of PCl
5
after the system has reached equilibrium.
Q11_(2pts)_Hydrogen iodide decomposes according to the equation 2HI(g) H
2
(g) + I
2
(g), for
which K
c
= 0.0156 at 400ºC. 0.550 mol HI was injected into a 2.00 L reaction vessel at
400ºC. Calculate the concentration of HI at equilibrium.
Q12_(2pts)_Sodium carbonate, Na
2
CO
3
(s), can be prepared by heating sodium bicarbonate,
NaHCO
3
(s).
2NaHCO
3
(s) Na
2
CO
3
(s) + CO
2
(g) + H
2
O(g) K
p
= 0.23 at 100ºC
If a sample of NaHCO
3
is placed in an evacuated flask and allowed to achieve equilibrium at
100ºC, what will the total gas pressure be?
A) 0.46 atm B) 0.96 atm C) 0.23 atm D) 0.48 atm E) 0.11 atm
Q13_(4pts)_At 340 K, K
p
= 69 for the reaction H
2
(g) + I
2
(g) 2HI(g). 50.0 g of HI is injected
into an evacuated 5.00-L rigid cylinder at 340 K. What is the total pressure inside the cylinder
when the system comes to equilibrium?
Q14_(4pts)_15.00 g of solid ammonium hydrogen sulfide is introduced into a 500.-mL flask
at 25°C, the flask is sealed, and the system is allowed to reach equilibrium. What is the
partial pressure of ammonia in this flask if K
p
= 0.108 at 25°C for NH
4
HS(s) NH
3
(g) + H
2
(g)?
S

Q15_(4pts)_At 700 K, the reaction 2SO
2
(g) + O
2
(g) 2SO
3
(g) has the equilibrium constant K
c
= 4.3 10
6
, and the following concentrations are present: [SO
2
] = 0.10 M; [SO
3
] = 10. M;
[O
2
] = 0.10 M. Is the mixture at equilibrium? If not at equilibrium, in which direction (as the
equation is written), left to right or right to left , will the reaction proceed to reach
equilibrium?