Part A Consider the reaction: CO2(g)+CCl4(g)?2COCl2(g). Calculate ?G for this re
ID: 1008255 • Letter: P
Question
Part A Consider the reaction: CO2(g)+CCl4(g)?2COCl2(g). Calculate ?G for this reaction at 25 ?C under these conditions. PCO2= 0.120 atm PCCl4= 0.180 atm PCOCl2= 0.760 atm
A Molecular View of Thermodynamics
Learning Goal:
To use molecular-level diagrams to predict the signs of thermodynamic properties.
The equations
?
G
?
=?RTlnK
and
?G=?H?T?S
relate entropy change,
?S
, enthalpy change,
?H
, free energy change,
?G
, and the equilibrium constant,
K
, for a given reaction at a given temperature.
Part A
The image represents a spontaneous, gaseous reaction at a constant temperature
T K
. Predict whether
?H
,
?S
, and
?G
for this reaction are positive, negative, or zero.
Drag the appropriate items to their respective bins.
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Correct
Part B
For the gaseous reaction shown here, the bins below represent three different possibilities for the equilibrium mixture. Classify each mixture by what it indicates about
?
G
?
,
K
, and
lnK
for the reaction at standard conditions.
Drag the appropriate items to their respective bins.
SubmitHintsMy AnswersGive UpReview Part
Provide Feedback
A Molecular View of Thermodynamics
Learning Goal:
To use molecular-level diagrams to predict the signs of thermodynamic properties.
The equations
?
G
?
=?RTlnK
and
?G=?H?T?S
relate entropy change,
?S
, enthalpy change,
?H
, free energy change,
?G
, and the equilibrium constant,
K
, for a given reaction at a given temperature.
Part A
The image represents a spontaneous, gaseous reaction at a constant temperature
T K
. Predict whether
?H
,
?S
, and
?G
for this reaction are positive, negative, or zero.
Drag the appropriate items to their respective bins.
SubmitHintsMy AnswersGive UpReview Part
Correct
Part B
For the gaseous reaction shown here, the bins below represent three different possibilities for the equilibrium mixture. Classify each mixture by what it indicates about
?
G
?
,
K
, and
lnK
for the reaction at standard conditions.
Drag the appropriate items to their respective bins.
SubmitHintsMy AnswersGive UpReview Part
Provide Feedback
Explanation / Answer
Using,
dG = -RTlnK
K = [COCl2]^2/[CO2][CCl4]
feeding the given values
K = (0.76)^2/(0.120)(0.180)
= 26.741
T = 25 oC + 273 = 298 K
R = gas constant
So,
dG = -8.314 x 298 ln(26.741) = -8.142 kJ/mol