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Chapter 1: Q11P (page 21)

For the reaction A鈫�Bat 298 K, the change in enthalpy is-7kJmol-1and the change in entropy is -25kJmol-1. Is the reaction spontaneous? If not, should the temperature be increased or decreased to make the reaction spontaneous?

Short Answer

Expert verified

螖贬鈮�罢螖厂thus the temperature is decreased to make the reaction spontaneous.

Step by step solution

01

Given data

The Gibbs free energy can be denoted as,

螖贬=-7kJ/mol螖厂=-25J/molK-1T=298K

02

Substitution

螖骋=螖贬-罢螖厂=-7000--298*-25=450J/mol

螖骋 is not positive spontaneous reaction.

03

Simplification

It can be denoted as,

螖G=螖H-T螖S=+ve螖G=螖H-T螖S鈮�0螖H鈮�T螖S

04

Conclusion

Therefore, the temperature is decreased to make the reaction spontaneous.

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