What is the delta s and delta h

Thread starter afcwestwarrior
Start date Apr 12, 2007
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In summary, delta s (Δs) is the change in entropy of a system and delta h (Δh) is the change in enthalpy. They can be calculated using the equations Δs = Sfinal - Sinitial and Δh = Hfinal - Hinitial, where S represents entropy and H represents enthalpy. These parameters are important in determining the spontaneity of a chemical reaction and can be used to calculate Gibbs free energy using the equation G = H - TS. Delta s and delta h can be negative, indicating a decrease in disorder or energy, and this can occur in exothermic reactions or reactions leading to more organized products.

Apr 12, 2007

afcwestwarrior

for OCL-
and HOCL

Chemistry news on Phys.org

Apr 12, 2007

afcwestwarrior

anyone have a link

Apr 13, 2007

Gokul43201

Staff Emeritus

Science Advisor

Gold Member

dS and dH for what? Formation?

Related to What is the delta s and delta h

1. What is the definition of delta s and delta h?

Delta s (Δs) is the change in entropy of a system, while delta h (Δh) is the change in enthalpy. Entropy is a measure of the disorder or randomness in a system, while enthalpy is a measure of the total energy in a system.

2. How do you calculate delta s and delta h?

Delta s and delta h can be calculated using the following equations: Δs = Sfinal - Sinitial and Δh = Hfinal - Hinitial. S represents the entropy, and H represents the enthalpy. The initial and final values for S and H can be obtained experimentally or through theoretical calculations.

3. What is the significance of delta s and delta h in a chemical reaction?

Delta s and delta h are important thermodynamic parameters that describe the energy changes that occur in a chemical reaction. Delta s and delta h can determine whether a reaction is spontaneous (favorable) or non-spontaneous (unfavorable).

4. How do delta s and delta h relate to Gibbs free energy?

Gibbs free energy (G) is a measure of the energy available to do work in a system at constant temperature and pressure. Delta s and delta h are used to calculate the Gibbs free energy using the equation G = H - TS, where T is the temperature in Kelvin.

5. Can delta s and delta h be negative?

Yes, delta s and delta h can be negative. A negative value for delta s indicates a decrease in disorder, while a negative value for delta h indicates a decrease in energy. This can occur in exothermic reactions where heat is released, or in reactions that lead to more organized products.