Question

For 2SO2(*g*)+O2(*g*)⇌2SO3(*g*),

*K**p*=3.0×104 at 700 K. In a 2.00-L vessel the
equilibrium mixture contains 1.18 g of SO3and 0.108 g of O2.

How many grams of SO2 are in the vessel?

Express your answer using two significant figures.

Answer #1

**consider the given reaction**

**2S02 + 02 ---> 2S03**

**now the equilibrium constant is given by**

**Kp = (pS03)^2 / (p02) (pS02)^2**

**now**

**we know that**

**PV = nRT**

**also**

**moles (n) = mass / molar mass**

**so for S03**

**P x 2 = ( 1.18 / 80) x 0.0821 x 700**

**P = 0.424 atm**

**so**

**pS03 = 0.424 atm**

**similarly for 02**

**P x 2 = ( 0.108 / 32) x 0.0821 x 700**

**P = 0.097**

**so**

**p02 = 0.097 atm**

**now**

**Kp = (pS03)^2 / (p02) (pS02)^2**

**so**

**3 x 10^4 = (0.424)^2 / ( 0.097) (pS02)^2**

**pS02 = 7.86 x 10-3**

**now**

**apply PV = nRT**

**so**

**7.86 x 10-3 x 2 = n x 0.0821 x 700**

**n = 2.735 x 10-4**

**now**

**mass = moles x molar mass**

**so**

**mass of S02 = 2.735 x 10-4 x 64**

**mass of S02 = 0.0175 g**

**so**

**0.0175 grams of S02 is present**

At 900 K the following reaction has Kp=0.345:
2SO2(g)+O2(g)⇌2SO3(g)
In an equilibrium mixture, the partial pressures of SO2 and O2
are 0.120 atm and 0.470 atm, respectively.
What is the equilibrium partial pressure of SO3 in the
mixture?
Express the pressure in atmospheres to three significant
digits.

1)A reaction vessel at 27 ∘C contains a mixture of SO2(P= 3.10
atm ) and O2(P= 1.00 atm ). When a catalyst is added the reaction
2SO2(g)+O2(g)⇌2SO3(g) takes place. At
equilibrium the total pressure is 3.85 atm.
-Find the value of Kc.
2)A sample of SO3 is introduced into an evacuated sealed
container and heated to 600 K. The following equilibrium is
established:
2SO3(g)⇌2SO2(g)+O2(g).
The total pressure in the system is found to be 3.0 atm and the
mole fraction...

A reaction vessel at 1215 K contains a mixture of SO2(P= 2.90
bar ) and O2(P= 1.20 bar ). When a catalyst is added the reaction
2SO2(g)+O2(g)⇌2SO3(g) takes place. At equilibrium the total
pressure is 3.85 bar . Find the value of K.

A reaction vessel at 27 ∘C contains a mixture of SO2(P= 3.10 atm
) and O2(P= 1.10 atm ). When a catalyst is added the reaction
2SO2(g)+O2(g)⇌2SO3(g) takes place. At equilibrium the total
pressure is 3.95 atm . Find the value of Kc.

For the balanced
reaction
2SO3 (s) <--> 2SO2 (g) +
O2 (s)
Kp= 1.32 at 627 celsius
A) find the volume at K at 627 celsius
B) If an otherwise empty chamber is filled with 42.3 torr of
SO3 , 69.5 torr of SO2 and 18.7 torr
O2 at 627 celsius, in which direction would the reaction
proceed? Justify.
C) What is the valve of Kp at 627 celsius for the reaction
6SO3 (g) <--> 6SO2 (g) + O2
(g)

Consider the following threeequilibria at 400oC
2SO2(g) + O2(g) ⇌ 2SO3(g) Kp=3.5×105
SO3(g) +H2O(g)⇌H2SO4(g) Kp =8.0×10^−12
H2O(g)⇌2H2(g) + O2(g) Kp=1.3×10^−33
What is Kc at 400oC for the following equilibrium?
SO2(g) +O2(g)+ H2(g)⇌H2SO4(g)

A reaction vessel at 27 ∘C contains a mixture of SO2
(P= 3.00 atm ) and O2 (P= 1.10 atm ). When a catalyst is
added the reaction
2SO2(g)+O2(g)⇌2SO3(g) takes place.
At equilibrium the total pressure is 3.85 atm .
Find the value of Kc

The equilibrium
2NO(g)+Cl2(g)⇌2NOCl(g)
is established at 500 K. An equilibrium mixture of the three gases
has partial pressures of 9.50×10−2 atm , 0.174 atm , and
0.27 atm for NO, Cl2, and NOCl, respectively.
Part A
Calculate Kp for this reaction at 500.0 K.
Express your answer using two significant figures.
Part B
If the vessel has a volume of 5.80 L, calculate
Kc at this temperature.
Express your answer using two significant figures.
.

Consider the following three equilibria at 400°C:
2SO2(g)+O2(g)⇌2SO3(g) Kp=.5*10^5
SO3(g)+H2O(g)⇌H2SO(g) Kp=8.0*10^-1
2H2O(g)⇌2H2(g)+O2(g)
Kp=1.3*10^-33
What is Kc at 400°C for the following equilibrium?
SO2(g)+O2(g)+H2(g)⇌H2SO4(g)

4. At a given temperature, the equilibrium constant Kc for the
reaction 2SO2(g) + O2(g) ⇌ 2SO3(g) is 3.0x10^9 . If 1.00 mol of SO2
and 2.00 mol of O2 are placed in a 1.00 L container and allowed to
react to equilibrium at this temperature, what is the concentration
of SO3 at equilibrium?
a) 0.500 M
b) 1.00 M
c) 2.00 M
d) 3.87 x10^4 M
e) none of these

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