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Chapter 1: Q13P (page 21)

Calculate or the reactionat when the equilibrium concentrations are. Is the reaction exergonic or endergonic under standard conditions?

Short Answer

Expert verified

The standard free energy change for the reaction is 螖骋0'=5.703kJmol-1.

Step by step solution

01

Given data

螖骋0'=5.703kJmol-1A+B鈬�C+D

Concentration of the reactants is A=10渭惭;B=15渭惭;

Concentration of the products is C=3渭惭;B=5渭惭;

Temperature, T=298 K

02

Calculating the standard free energy change 

螖骋0'=-RTlnKeq=-RTlnCDAB

03

On substituting the standard free energy change values

螖G0'=-8.314脳298脳ln3脳510脳15鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�=-2477.57脳ln1-ln10鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�=-2477.57脳-2.302鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�鈥�=5703.37kJmol-1螖G0'=5.703kJmol-1

Therefore, the standard free energy change for the reaction is螖骋0'=5.703kJmol-1.

Hence, the reaction is nonspontaneous or endergonic at standard conditions.

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