Free energy = work done ∆G = p∆v 2.9J= P(v2 - v1)
v=m/d
2.9= P(12/2.25 - 12/3.51) × 10^-6(m) × . 10^-3(kg) . 2.9= P(5.33 - 3.418) × 10^-9 2.9= P × 1.91 × 10^-9 P= 2.9/1.91×10^-9 P= 1.518 × 10^9 Pa
(3 P.) The density of graphite is 2.25 g.cm3, and that of diamond is 3.51 g.cm...
2. Consider the following phase transition: C (graphite) - C(diamond). (a) (6 points) The temperature dependence of reaction Gibbs energy. AGA, for the above reaction is given by AG (mol) = 1895 +3.3637 at 1 atm. Calculate AH, and AS, at 298.15K and 1 atm. (b) [9 points) The density of diamond is 3.52 g/ml and that of graphite is 2.25 g/ml. The formation free energy (AG) of diamond is 2.90 kJ/mol and that of graphite is zero at 298.15...
Given the relative costs, making diamond from graphite would appear to be an economically sound proposition. The free energy difference for the process: C (s, graphite) ----> C (s, diamond) s ∆Gθ = 2.900 kJ/mol at 25oC. The densities of these materials are density diamond = 3.51 g/cm3 and density of graphite = 2.26 g/cm3 . Estimate the pressure required to convert graphite to diamond.
8. Given the relative costs, making diamond from graphite would appear to be an economically sound proposition. The standard free energy difference for the solid-solid phase change C(s, graphite)C(s, diamond) is Δ๔ : μdiamond-graphite-2.900 kJ mol-1 (at 25°C), The densities of these materials are ρ(diamond): 3.51 g cm-3 and ρ(graphite): 2.26 g cm-3. Estimate the pressure required to convert graphite to diamond
1. Determine the standard Gibb's free energy change for the conversion of diamond into graphite in units of kJ/mol and is it spontaneous, nonspontaneous, or neither. Cdiamond (s) ? Cgraphite (s) f° for diamond = 2.9 kJ/mol f° for graphite = 0.0 kJ/mol (Please be careful wtih sig figs.) 2. For the following reaction, = 68.1 kJ/mol: 2 C(s) + 2 H2(g) ? C2H4(g) Determine for the reaction in units of kJ/mol at 1800. K, a partial pressure of C2H2 of...
The standard Gibbs free energy for the transformation of diamond to graphite at 298 K is -2.9 kJ/mol. Why are diamonds not spontaneously transformed to graphite? C(diamond)→C(graphite) Δ?0=−2.9kJ/mol
Problem. 4·The extent of reaction generally depends on pressure as well as temperature. For the reaction C (graphite)C (diamond) the standard state free energy change at 25 C is 2866 J/mol. The density of graphite is 2.25 g/cc and that of diamond is approximately 3.51 g/cc; both solids may be considered to be incompressible. To help chemical engineering students pay their tuition, we are thinking of setting up equipment to run this reaction in the senior laboratory. Estimate what pressure,...
Diamon and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite so slowly that the enthalpy change of the process must be obtained indirectly. Determine delta H rxn for C(diamond) > C(graphite) with equations from the following list: Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to graphite so slowly that the enthalpy change of the process must be obtained indirectly. Determine AHxn for C(diamond)...
The conversion of C(diamond) right arrow C(graphite) is thermodynamically spontaneous. However, at room temperature and pressure one does not observe diamond converting to graphite. The most reasonable explanation of these data is that the conversion of graphite to diamond is rapid. spontaneity does not imply anything about the rate of reaction. diamond and graphite are at equilibrium. diamond is thermodynamically stable.
We consider two phases of solid carbon: diamond and graphite, with S0diamond= 2.44 J/(K ∙ mol) and S0 graphite = 2.3 ∙ S0diamond . Which of the two carbon modifications is more stable if we establish a thermal equilibrium between them in an isolated system?
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K? Cdiamond?Cgraphite Express your answer to three significant figures and include the appropriate units. Gibbs free energy is a measure of the spontaneity of a chemical reaction. It is the chemical potential for a reaction, which is minimized at equilibrium. It is defined as G=H?TS Elemental carbon usually exists in one of two forms: graphite or diamond. It is generally believed that diamonds last...