Calculate the approximate minimum pressure needed using ∆ fG = 0 for graphite and ∆ fG = +2,900 J mol–1 for diamond. It is hardest substance known and its density is equal to 3.5 gram/ml Graphte is soft and slippery with the density of 2.3 gram/ml: 2. The stable bonding configuration of carbon at NTP is graphite, as shown in figure 2.1, with an energy difference between the graphite and the diamond of 0.02 eV per atom. In a diamond, the carbon atoms are arranged tetrahedrally. Diamonds have been successfully prepared by submitting graphite to high pressure. Diamond, the name of which according to one of the versions comes from the ancient Greek "almas" - indestructible - is a precious stone, but is used not only in jewelry. Graphite (/ ˈ ɡ r æ f aɪ t /), archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure.It occurs naturally in this form and is the most stable form of carbon under standard conditions.Under high pressures and temperatures it converts to diamond.Graphite is used in pencils and lubricants. A pure substance can take many forms, which don't have the same properties. Diamond and also graphite are chemically the same, both made up of the element carbon, however, they have entirely different atomic and also crystal frameworks. For example, carbon can take the form of graphite or diamond. The use of the electrical resistance furnace to manufacture synthetic graphite led to the development of manufactured forms of carbon in the Due to the high energetic barrier between the two phases of carbon, the transition from diamond to the stablest phase of graphite at normal conditions is very slow. 3. The densities of the two forms may be taken as independent of pressure and are 2.25 and 3.51 g cm–3, respectively. Is Diamond more dense than graphite? Density @ 293 K Graphite – 2.26 g/cm3 Diamond – 3.53 g/cm3 Color Black, gray The history of manufactured graphite began at the end of the 19th century with a surge in carbon manufac- turing technologies. The factor for the differences in firmness as well as various other physical homes can … For solids, it's also affected by the way atoms and molecules stack together. This accounts for diamond’s hardness, extraordinary strength and durability and gives diamond a higher density than graphite (3.514 grams per cubic centimeter). Many of the wisdom of the people reflect the property of one of the most beautiful stones on earth: "pure diamond", "hard as a diamond," "diamond brilliance", etc. A line between the diamond and graphite phases represents a phase boundary, and tell us precisely what temperature and pressure are required for these two phases to be in equilibrium. 5.1. Solution: ... Density (kg/m3) Aluminum oxide Al 2O 3 140–240 1000–2900 310–410 2000–3000 0.26 4000–4500 Cubic boron nitride CBN 725 7000 850 4000–5000 — 3480 Diamond — 1400 7000 830–1000 7000–8000 — 3500 Diamond: Graphite: 1. Ceramics, Graphite, and Diamond: Structure, General Properties, and Applications . Diamond atoms have a rigid 3 dimensional structure with each atom carefully loaded with each other as well as connected to 4 other carbon atoms. Both are chemically identical, but they do not share an identical density value. Density depends on temperature and pressure. Diamond has a melting point of about 3843 K, which is very high, and a high density of about 3.51 g/cm 3. Since its valence electrons involved in the C-C sigma covalent bonds, it is known to be a poor conductor of electricity, and thus they are localized and are not free to conduct the electricity. And one of the properties is density. density diamond = 3.51 g/cm^3 density graphite = 2.26 g/cm^3 Estimate the pressure at which these two forms of carbon are in equilibrium at 25*C. This is a homework question for my thermo II class, I have been looking at it for a day or so now and can't come up with a solution. Its crystals are Octahedral, colorless and transparent : It is in a black colored, opeque and has hexagonal crystals. Is in a black colored, opeque and has hexagonal crystals forms may be taken as independent pressure., colorless and transparent: It is in a black colored, opeque and has hexagonal.... 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