The most intriguing fact about diamond and graphite is their relative stability. Experimentally, graphite is thermodynamically more stable at 1 atm and 298 K, but only barely (ca. 2 kJ mol−1, that is, they are degenerate within a chemical accuracy of 1 kcal mol−1).
Is diamond or graphite more thermodynamically stable?
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 diamond is more stable than graphite at high pressure?
Diamond can still be more stable than graphite under high pressure. This is because the total entropy of the system with the environment tends to increase. Gibbs free energy of the diamond is less as compared to Gibbs free energy of graphite at high pressure.
How graphite is thermodynamically most stable allotrope?
All carbon allotropes are solids under normal conditions, with graphite being the most thermodynamically stable form. They are chemically resistant and require high temperature to react even with oxygen.
Is graphite better than diamond?
Diamond is obviously far more valuable than graphite. … Graphite forms in layers or sheets where the carbon atoms have strong bonds on the same plane or layer, but only weak bonds to the layer above or below. The carbon atoms in diamond, on the other hand, have strong bonds in three dimensions.
Which is the most stable Carbanion?
Note: Remember primary carbanion and methyl carbanion are the most stable carbanions.
Which substance at 25 C is more stable diamond or graphite?
The standard enthalpy of formation of diamond ( Hof = 2.425 kJ/mol) is slightly larger than the enthalpy of formation of graphite, which is the most stable form of carbon at 25oC and 1 atm pressure. At very high temperatures and pressures, diamond becomes more stable than graphite.
Does a diamond last forever?
Over three billion years old, and nearly as old as the earth itself, a diamond is indestructible and a diamond quite literally is Forever.
Can graphite convert diamond?
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.
Are Diamonds stable?
Diamond is thermodynamically stable at high pressures and temperatures, with the phase transition from graphite occurring at greater temperatures as the pressure increases.
Which is the most stable form?
The most stable form of carbon is graphite.
Which is the most stable allotrope of Sulphur?
Below about 96 °C, rhombic sulfur is the more stable allotrope.
Which phosphorus is thermodynamically most stable?
Black phosphorus is the thermodynamically stable form of phosphorus at room temperature and pressure, with a heat of formation of -39.3 kJ/mol (relative to white phosphorus which is defined as the standard state).
Why are diamonds more expensive than graphite?
Also, as a result of the rarity, a Diamond is far more expensive than Graphite. … In Diamonds, the atoms are carefully packed with together with each atom connected to various other carbon atoms as compared to Graphite where the bonds in between the layers are weak.
Why is graphite slippery?
Graphite has delocalised electrons, just like metals. … The forces between the layers in graphite are weak. This means that the layers can slide over each other. This makes graphite slippery, so it is useful as a lubricant .
Why diamond is much harder than graphite?
However, diamond is harder than graphite because of the carbon atoms in a diamond form 4 covalent bonds in the form of tetrahedral structure. While the carbon atoms in the graphite form 4 covalent bonds in the form of hexagonal structure. … This is the reason why diamond is harder than graphite.