CHEM-002 Lecture Notes - Lecture 11: Haber Process, Sulfur Trioxide, Partial Pressure

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chocolatedeer31

13 Feb 2017

School

Georgetown University

Department

Chemistry

Course

CHEM-002

Professor

Dedios Angel

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Document Summary

Do not include solids and liquids in the equilibrium expression use only gases and liquids. The partial pressure of a gas is directly proportional to its concentration, so you can calculate kc from kp and otherwise. The formula for this is: kp = kc(rt) n, (cid:449)he(cid:396)e (cid:374) is the (cid:373)oles of gas. The energy of a reaction takes into account the beginning and end states of the reactant. A catalyst lowers the transition state, but it does not lower the equilibrium constant because the equilibrium constant looks at the total energy change not the transition state. K is not affected by catalysts! kf = ace-eaf/rt kr = are-ear/rt. At 600degrees c, k2 has a value of 9. 5. So2 is placed in a sealed flask with oxygen. At equilibrium, 62% of the so2 has reacted to give. If 62% has reacted, the partial pressures are 38% so2 and 62% so3. [po2] = ([pso3] / k2[pso2])2 = (0. 62/(9. 5 * 0. 35))^2 = 0. 03476963084.

Related Questions

For the reaction 2SO2 (g) + O2 (g) <-----> 2SO3 (g)

At 350 K, the equilibrium concentrations were observed to be [SO2]= 0.075 M, [O2] = 5.5 x 10-2 M, and [SO3] = 0.50 M in a 2.00 literrigid container.

f) State whether the delta H, enthalpy change, for the reaction ispositive, negative, or zero. Justify your answer

g) In another reaction at 375 K, 14.56 grams of ï»¿SO₃gas was placed into the 2.00 liter rigid container, after severalhours the total pressure of the container held to a constant valueof 5.20 atm. What is the partial pressure ofeach gas at equilibrium?

To help, I have found Kc = 8.1, Kp = 0.28, delta G = 3700 Joules,and that delta S is negative.

scarletpug934

To help, I have found Kc = 8.1, Kp = 0.28, delta G = 3700 Joules,and that delta S is negative.

Â± Calculating Equilibrium Constants
The equilibrium constant, K, of a reaction at a particular temperature is determined by the concentrations or pressures of the reactants and products at equilibrium.

For a gaseous reaction with the general form

aA+bBâcC+dD

the Kc and Kp expressions are given by

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

Kp=(PC)c(PD)d(PA)a(PB)b

The subscript c or p indicates whether K is expressed in terms of concentrations or pressures. Equilibrium-constant expressions do not include a term for any pure solids or liquids that may be involved since their composition does not change throughout the reaction. The standard state of a pure substance is the pure substance itself, and although the quantity may change the sample remain pure. The concentration is effectively equal to 1, and will not impact the magnitude of K.
Part A
Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. Phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures:

CO(g)+Cl2(g)âCOCl2(g)

Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 456 âC . At equilibrium, the concentrations were measured and the following results obtained:

Gas Partial Pressure
(atm)
CO 0.900
Cl2 1.18
COCl2 0.250

What is the equilibrium constant, Kp, of this reaction?
Express your answer numerically.

Kp =
0.235

SubmitHintsMy AnswersGive UpReview Part
Correct
Deriving concentrations from data
In Part A, you were given the equilibrium pressures, which could be plugged directly into the formula for K. In Part B however, you will be given initial concentrations and only one equilibrium concentration. You must use this data to find all three equilibrium concentrations before you can apply the formula for K.
Part B
The following reaction was performed in a sealed vessel at 774 âC :

H2(g)+I2(g)â2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.10M and[I2]=2.10M. The equilibrium concentration of I2 is 0.0600 M . What is the equilibrium constant, Kc, for the reaction at this temperature?
Express your answer numerically.

Kc =

CHEM-002 Lecture Notes - Lecture 11: Haber Process, Sulfur Trioxide, Partial Pressure

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