LaGuardia Community Co x Ccalculate ?G Degree For C pling 2576000 sapling Learni

Question

LaGuardia Community Co x Ccalculate ?G Degree For C pling 2576000 sapling Learning I LaGuardia Community Col My Assig t 5/31/2016 11:00 PM 8.8/10 @5/28/2016 o7:18 PM Gradebook Attempts score Print in Calculator Periodic Table X Incorrect X Incorrect X Incorrect X Question 14 of 25 Given the following information AH 636.9 kJ AS 282.0 J K AH 422.0 kJ AS 215.0 J /K calculate AG for the following reaction at 298 K Number 1268.72 kJ AG Previous 3 Give Up & View Solution Check A Next Exit d Wind Resources Assignment Information Available From: 5/5/2016 06:00 PM 5/31/2016 11:00 PM Due Date: Points Possible: 10 Grade Category: HW 6 Description Policies: Practice You can check your answers. You can view solutions when you complete or give up on any question. You can keep trying to answer each question until you get it right or give up There is no penalty for incorrect answers. O eTextbook O Help With This Topic OWeb Help & Videos O Technical Support and Bug Reports O Logout Help

Explanation / Answer

Let us find out Gibbs free energy changes (Go) for both the given reaction in specified direction using Gibbs equation,

Go = Ho –TSo

1) A + B ---------> 2D   …………..(Reaction-1)

Given: Ho = 636.9 kJ = 636900 J So = 282.0 J/K    T = 298 K

Using Gibbs equation, say GAo = ?

GAo = 636900 –298 x 282

GAo =636900 –84036

GAo = 552864 J

GAo = 552.864 kJ ……………..(1)

2) C -------> D

Given: Ho = 422 kJ = 422000 J So = – 215.0 J/K    T = 298 K

Using Gibbs equation, G1o = ?

G1o = 422000 – (–215 x 298)

G1o = 422000 + 64070

G1o = 486070 J

G1o = 486.070 kJ

Hence for the reaction,

2C ---------> 2D

We will have, say

G2o = 2 x G1o = 2 x 486.070 kJ

Go = 972.140 kJ

And for reverse reaction :

2D -----------> 2C    …………………….(Reaction-2)

we will have, Say

GBo = – G2o = – 972.140 kJ

Now on adding reaction-1 and reaction-2 we will have,

A + B + 2D   ---------> 2D + 2C

On cancelling common things we

A + B ---------> 2C

This is the required reaction for which Standard Gibbs energy change (Go)we want.

And corresponding Gibbs energy change will be,

Go = GAo + GBo

Go = (552.864) + (–972.140)

Go = – 419.276 kJ

Hence the Standard Gibbs energy change (Go) for given transformation.

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