Delta G and G naught

[lwon Dis2I]

What is the difference between Delta G and Delta G naught? And how do you know which equation to use in problems?

[Chem_Mod]

DeltaG naught is deltaG at standard conditions. You will not always be doing reactions at standard conditions so we have an equation to convert between the two. Problems that ask for dG naught will typically ask for dG of a reaction done under standard conditions

[Dominic Benna 2E]

Delta G naught is at standard conditions. You will know to use this in your equation if they give the standard condition values or say that the system is under standard conditions.

[Sedge Greenlee]

As others have stated deltaGo is the deltaGunder standard conditions. However, I think what's most important to remember about the relationship between deltaGo and deltaG is that they can be used to find each other given Q as deltaG = deltaGo + RTln(Q).

[Justin Nguyen 3E]

As the others said, ΔG naught is the change in gibbs free energy at standard conditions as opposed to ΔG. What helped me distinguish when to use the equation for these terms was that you usually have to find ΔG naught when given K and ΔG when just giving either Q, or the concentrations/pressures of the reactions and products.

[Claire_Latendresse_1E]

Also, it's good to note that STP (standard temperature and pressure) is 273 K (or 0°C) for temperature and 1 atm for pressure. :)

[Nayra Gharpetian 3F]

Delta G is at standard conditions. standard conditions are 1 atm and 298 K (room temp, 25 degree Celsius)

[Ariel Guan 1H]

Delta G naught is at standard conditions, meaning 273K (temp) and 1 atm.

[Shruti Kulkarni 2I]

Delta G naught is the standard reaction Gibbs free energy. If the reaction is not occurring at standard conditions, then regular gibbs free energy is used, which takes into account variations in the temperature, pressure, and anything else.

[Ritika Prasad 1A]

Also remember in addition to deltaG = deltaGo + RTln(Q), deltaG equals 0 at equilibrium, which gives you deltaGo = -RTln(K) at equilbrium!

[VincentLe_3A]

Delta G naught is the change in Gibbs free energy at standard conditions, whereas Delta G is the change at a specific condition. The key to determining which to use is to see if standard condition values are given or if the system is at equilibrium, then that means Delta G is zero.

[Joel Meza 3I]

Delta G is the change in Gibbs free energy at any conditions, while delta G naught is the change in Gibbs free energy change at standard conditions (e.g. 298K and 1 atm).

[Astha Sahoo 3I]

Delta G not is at standard conditions, and delta G is at any temperature. You can use delta g not to find the delta g at other temperatures

[Kristina Krivenko 3I]

The main difference between delta G and delta G naught is that delta G naught is delta G at standard conditions (1atm and 25 degrees Celsius / 298.15 K).

[Olivia Monroy 1A]

Delat G naught is change in Gibbs free energy under standard conditions (1 atm, 298 K), while delta G is not in these conditions. Delta G naught can be used to find delta G, equations are included on the eq/constant sheet to calculate the two.

[sophia kosturos 2B]

delta G refers to Gibbs free energy. While delta G naught refers to standard Gibbs free energy, which is free energy at standard conditions (298 K and 1 atm).

[RitaThomas_3G]

Using the information that many people have stated above, I think its also important to note that if delta G is negative it is spontaneous, and positive is not spontaneous. However, knowing the sign of delta G naught does not prove spontaneity. Because, according to the equation for delta G, there are other factors that might affect the reaction.

[Vivian_Le_1L]

Delta G naught is the change in Gibbs free energy at standard conditions (1 atm and 25 degrees Celsius/298.15 K) , whereas Delta G is the change at a specific condition.

[Simran Bains 2C]

Delta G naught is at standard conditions, whereas Delta G isn't at standard conditions necessarily.

[Kyle Dizon 3A]

Delta G simply just refers to the free energy of the system. The delta G naught often refers to a more specific standard conditions of free energy.

[Griffin G]

Anything "naught" is typically at standard conditions. Most things don't occur under standard conditions, so you would have to use deltaG instead. Think of deltaGnaught as like, the unobtainable ideal.

[Sahaj Patel Lec3DisK]

Delta G is Gibbs free energy while Delta G naught is the standard Gibbs free energy. Its delta G that tells you if a system is at equilibrium (if it equals 0), not delta G naught.

[Joshua Chung 2D]

Delta G naught is simply Delta G under standard conditions (273 K / 0˚C, 1 atm).

[Lauren Sarigumba 1K]

Delta G nought is fixed for a given reaction and temperature and so it does not change as the reaction proceeds. Delta G, on the other hand, depends on the composition of the reaction mixture and so it varies as the reaction proceeds.

[Ellison Gonzales 1H]

Do Delta G and Delta naught have the same units? Or does it depend on the situation?

[Adrienne Chan 1G]

@Ellison I believe delta G and delta G naught can have the same units! Usually it's kJ/mol

[Hasan Mirza 3F]

Naught is telling you that the system is at standard conditions of temperature and pressure.

[Ranen_Chang_2G]

is at standard conditions (298K and 1atm). You can use the equation = +RTlnQ to determine its relationship.

[Sara Sandri 2B]

Delta G nott is under standard conditions while delta G (no nott) is under not standard conditions.

[Jason Knight - 1F]

Delta G naught is the value when applied under standard conditions. Delta G refers to the free energy of the system and is dependent on variables such as temperature and where the reaction proceeds.

[Brian Bui 3H]

The little degree sign that reads "naught" represents standard conditions, so Delta G Naught is Delta G at standard conditions. (Same thing goes for Delta H Naught and Delta S Naught)

[Vanessa Perez]

As others have stated deltaGo is the deltaGunder standard conditions. However, I think what's most important to remember about the relationship between deltaGo and deltaG is that they can be used to find each other given Q as deltaG = deltaGo + RTln(Q).

So if deltaG = 0, does that mean that deltaGo= RTln(Q) ? Or does that relationship not exist?

[305572629]

Delta G by itself is the free energy of a particular system; Delta G naught is the standard conditions of free energy for a system.

[Mursall M 2A]

Delta G naught is when the reaction is in standard conditions and the reaction is at equilibrium, whereas Delta G is at any moment during a reaction!

[Madison Wong 3H]

Delta G naught is under standard conditions, while G can change as the reaction progresses.

[Tiao Tan 3C]

∆Gº is ∆G at standard conditions, while ∆G can be under any conditions and they vary with the conditions.

[BoparaiAdeshsurjit2F]

Whenever there is naught means we are talking about Standard Conditions.

[Sedge Greenlee]

As others have stated deltaGo is the deltaGunder standard conditions. However, I think what's most important to remember about the relationship between deltaGo and deltaG is that they can be used to find each other given Q as deltaG = deltaGo + RTln(Q).

So if deltaG = 0, does that mean that deltaGo= RTln(Q) ? Or does that relationship not exist?

Well, since when deltaG = 0, the system is at equilibrium, so Q would = K. This means that the relationship isn't deltaGo = -RTlnQ but instead deltaGo = -RTlnK (an equation on our constants sheet)!

[DPatel_2L]

G naught is under standard conditions.

[Edgar Velazquez 2K]

Whenever you see a naught, that means that the problem is occurring at standard conditions.

[Aria Movassaghi 1A]

Delta g naught is delta g at standard conditions

[Brian Acevedo 2E]

refers to the change in Gibbs Free Energy, whereas refers to the change in Gibbs Free Energy under standard conditions (P=1 atm, T=273K).

[Annabella_Amato_1I]

delta G naught is delta G under standard conditions

[Gicelle Rubin 1E]

As others have said, Delta G naught is at standard conditions :)

[Yun Su Choi 3G]

One difference between the two is that deltaG naught isn't always equal to 0 at equilibrium (negative when K>1, positive when K<1, and 0 when K=1) while delta G is equal to 0 at equilibrium (no work done).

[Jacquelyn Challis 2B]

What are standard conditions?

[Diana Aguilar 3H]

Like many have stated, delta G naught is at standard conditions, while delta G is not