# MCQ- What is the Gibbs free energy value?

• Chemistry
• TytoAlba95
In summary, Gibbs free energy is a thermodynamic quantity that measures the amount of energy available for work in a system. It takes into account enthalpy and entropy and is important for understanding chemical reactions. The value can be calculated using the equation ∆G = ∆H - T∆S and a negative value indicates a spontaneous reaction. Temperature affects the value, with higher temperatures resulting in a more negative ∆G. The Gibbs free energy value can also be used to predict the feasibility of a reaction.
TytoAlba95
Homework Statement
NA
Relevant Equations
NA

Where have I gone wrong?
According to the key, the right option is a.

I think that ##\Delta G = \Delta G^0 + RTln(c_B/c_A)##, where ##c_A## and ##c_B## are the concentrations of species ##A## and ##B##, respectively.

jim mcnamara and TytoAlba95
As long as it is not clearly stated in what units given answers are, every one of them can be correct (well, perhaps the only thing that allows differentiation between them is the sign).

jim mcnamara and TytoAlba95
Thanks

## 1. What is Gibbs free energy?

Gibbs free energy, also known as free enthalpy, is a thermodynamic property that measures the maximum amount of work that can be extracted from a system at constant temperature and pressure.

## 2. How is Gibbs free energy related to spontaneity?

The change in Gibbs free energy (ΔG) is directly related to the spontaneity of a process. If ΔG is negative, the process is spontaneous and can occur without any external input of energy. If ΔG is positive, the process is non-spontaneous and requires an input of energy to occur.

## 3. What is the equation for calculating Gibbs free energy?

The equation for calculating Gibbs free energy is ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

## 4. What is the significance of the value of Gibbs free energy?

The value of Gibbs free energy indicates whether a reaction or process is energetically favorable or not. A negative value indicates that the reaction or process is spontaneous, while a positive value indicates that it is non-spontaneous.

## 5. How is Gibbs free energy used in chemical reactions?

Gibbs free energy is used to determine the direction and spontaneity of chemical reactions. It can also be used to calculate the equilibrium constant for a reaction, which is a measure of the extent to which the reaction will proceed towards products.

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