Are Delta G and Delta G knot equal at 298K and with the same concentrations?

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In summary, Delta G is a thermodynamic quantity that measures the available energy in a system to do useful work and takes into account both heat and disorder. Delta G knot is the standard Gibbs free energy change and is used to calculate the energy released or absorbed during a chemical reaction under specific conditions. Delta G is also related to spontaneity, with a negative value indicating a spontaneous reaction and a positive value indicating a non-spontaneous reaction. It can be used to predict the direction of a reaction and can be calculated using two different equations.
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luysion
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Gibbs free energy and Gibbs Free energy under standard conditions;
Hi. Is a value of Gibbs free energy (delta G) and Gibbs free energy Under standard conditions (delta G knot) the same if they are both calculated under the same temperature (298K)? cheers
 
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You need to take into account standard pressure as well.
 
  • #3
Not to forget concentrations.
 

FAQ: Are Delta G and Delta G knot equal at 298K and with the same concentrations?

What is Delta G?

Delta G, also known as Gibbs free energy, is a thermodynamic quantity that measures the amount of energy available in a system to do useful work. It takes into account both the enthalpy (heat) and entropy (disorder) of a system.

What is Delta G knot?

Delta G knot, also known as the standard Gibbs free energy change, is the amount of energy released or absorbed during a chemical reaction under standard conditions (1 atm pressure, 298 K temperature, and 1 M concentration).

How is Delta G related to spontaneity?

Delta G is a measure of spontaneity in a reaction. A negative value for Delta G indicates that the reaction is spontaneous, meaning it can occur without any outside energy input. A positive value for Delta G indicates that the reaction is non-spontaneous and requires an input of energy to occur.

Can Delta G be used to predict the direction of a reaction?

Yes, Delta G can be used to predict the direction of a reaction. A negative value for Delta G indicates that the reaction will proceed in the forward direction, while a positive value indicates that the reaction will proceed in the reverse direction. A value of zero for Delta G indicates that the reaction is at equilibrium.

How is Delta G calculated?

Delta G can be calculated using the equation: Delta G = Delta G knot + RTln(Q), where R is the gas constant (8.314 J/mol K), T is the temperature in Kelvin, and Q is the reaction quotient. Alternatively, it can also be calculated using the equation: Delta G = Delta H - TDelta S, where Delta H is the change in enthalpy and Delta S is the change in entropy.

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