Quick Answer: Is graphite or diamond more thermodynamically stable?

Students are likely to get confused between diamond and graphite for thermal stability. Diamond has a rigid and compact structure due to which it takes more energy and time to convert into graphite and therefore, it is kinetically more stable but thermodynamically less stable than graphite.

Which is stable diamond or graphite?

Although graphite is a more stable form of crystalline carbon than diamond under normal conditions, there is a significant kinetic energy barrier that the atoms must overcome in order to reach the lower energy state. Diamond is therefore a metastable state.

Why is graphite so thermodynamically stable?

Graphite containes one delocalised electron per carbon. These cause greater attraction between carbon atoms hence giving stronger bonds, more stability to the structure.

Is diamond to graphite thermodynamically favorable?

According to thermodynamics, the reaction from diamond to graphite is spontaneous and favorable. However, because kinetics rather than thermodynamics is controlling this reaction, it occurs extremely slowly. So, diamond is kinetically stable, but thermodynamically unstable.

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Which of the following is thermodynamically most stable?

The correct answer is Graphite. Change in enthalpy of carbon in diamond to graphite form is negative. It shows that graphite should be more stable than diamond. The melting point of graphite is more than diamond which implies that it is a thermodynamically most stable allotrope of carbon.

Is diamond thermodynamically stable?

At normal temperatures and pressures, graphite is only a few eV more stable than diamond, and the fact that diamond exists at all is due to the very large activation barrier for conversion between the two. … So diamond is said to be metastable, since it is kinetically stable, not thermodynamically stable.

Is graphite unstable?

Graphite is a layered material with sp2 hybridized carbon–carbon bonds within the graphene layers and weak van der Waals (vdW) interactions between the graphene layers. … using vdW functionals reported similar results. Both confirmed that lower-stage Na-GICs are unstable.

Why is diamond less thermodynamically stable than graphite?

Diamond has a rigid and compact structure due to which it takes more energy and time to convert into graphite and therefore, it is kinetically more stable but thermodynamically less stable than graphite.

Why is diamond different from graphite?

Both have Giant Covalent Structures, resulting in very high melting temperatures. However each carbon atom in Diamond has 4 covalent bonds with other Carbons, making it extremely strong and hard. On the other hand, each carbon in graphite is bonded to three carbons, and therefore graphite is formed in layers.

Which is more reactive graphite or diamond?

Graphite is the most stable allotrope of carbon. … Density: Graphite’s specific gravity is 2.3, which makes it lighter than diamond. Chemical activity: it is slightly more reactive than diamond. This is because the reactants are able to penetrate between the hexagonal layers of carbon atoms in graphite.

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Is graphite to diamond endothermic?

The conversion of diamond into graphite is an endothermic reaction.

Is diamond to graphite spontaneous at all temperatures?

Diamond is not stable at room temperature and pressure. It slowly, but inevitably, converts into amorphous carbon, graphite and . So the reaction has a Gibbs free energy meaning that the reaction is spontaneous (negative value of free energy) and, as you correctly state, does occur.

Why do diamonds turn into graphite?

Diamond is the high-pressure phase that forms deep in the earth. Under normal conditions, diamond is metastable, meaning that it converts back to graphite when the process is initiated with sufficient energy. … It can switch its internal structure to a different order, thereby turning into graphite.

Which compound is thermodynamically stable?

According to the textbook, the terms “stable” and “unstable” refer to the thermodynamic tendency of a substance to decompose into its elements. Furthermore, a thermodynamically stable compound just means a compound that has a negative standard Gibbs free energy of formation.

Which of the following compound is thermodynamically less stable?

Ozone is thermodynamically less stable because it decomposes into oxygen and this decomposition result in the liberation of heat, so its entropy is positive and free energy is negative.

Which state of molecule is thermodynamically more stable?

Chemical systems might undergo changes in the phase of matter or a set of chemical reactions. State A is said to be more thermodynamically stable than state B if the Gibbs free energy of the change from A to B is positive.