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The standard enthalpy of combustion (ΔH_comb) of phenol (C6H5OH) is approximately -3000 kJ/mol. This value reflects the energy released when one mole of phenol is completely burned in oxygen to produce carbon dioxide and water. The exact value can vary slightly depending on the source and measurement conditions, but it generally indicates that phenol is a relatively high-energy compound.
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What equation represents an exothermic reaction at 298 k?
An exothermic reaction releases heat, leading to a decrease in enthalpy. A general equation representing an exothermic reaction at 298 K can be written as: [ A + B \rightarrow C + \Delta H ] where (\Delta H) is negative, indicating that energy is released in the process. For example, the combustion of methane can be represented as: [ CH_4(g) + 2 O_2(g) \rightarrow CO_2(g) + 2 H_2O(g) + \Delta H ] with (\Delta H) being a negative value.
What is delta h in the equation delta g delta h - t delta?
The change in enthalpy between products and reactants in a reaction
Why doesn't phenol react with carbonates?
Phenol does not react with carbonates because it is a weak acid and does not release hydrogen ions (H⁺) readily enough to react with the carbonate ions (CO₃²⁻). For a reaction to occur, phenol would need to be able to donate a proton to the carbonate, which is not favorable due to phenol's low acidity compared to stronger acids. As a result, the carbonate remains unreacted in the presence of phenol.
What is the delta H for 1-propanol?
The standard enthalpy of combustion for 1-propanol is approximately -2026 kJ/mol, meaning that the heat released when 1 mol of 1-propanol is completely burned is 2026 kJ.
Why pH of phenol varies in water and glycerin?
The pH of phenol varies in water and glycerin due to differences in their solvent properties. Water, being a polar solvent, can facilitate the ionization of phenol, leading to a lower pH because phenol can donate protons (H⁺ ions). In contrast, glycerin is a less polar solvent and has a higher viscosity, which reduces the solubility and ionization of phenol, resulting in a higher pH. Thus, the solvent's characteristics significantly influence phenol's acidity and its behavior in solution.
How do you figure out molar heat of combustion of phenol at 25 degrees celsius?
The molar heat of combustion of phenol can be calculated by measuring the heat released when a known amount of phenol is completely burned in a calorimeter. The heat released is then used to calculate the molar heat of combustion using the mass of phenol burned and the molar quantity of phenol. This calculation can be done using the formula: heat released = molar heat of combustion x moles of phenol.
What equation represents an exothermic reaction at 298 k?
An exothermic reaction releases heat, leading to a decrease in enthalpy. A general equation representing an exothermic reaction at 298 K can be written as: [ A + B \rightarrow C + \Delta H ] where (\Delta H) is negative, indicating that energy is released in the process. For example, the combustion of methane can be represented as: [ CH_4(g) + 2 O_2(g) \rightarrow CO_2(g) + 2 H_2O(g) + \Delta H ] with (\Delta H) being a negative value.
What is delta h in the equation delta g delta h - t delta?
The change in enthalpy between products and reactants in a reaction
What is Conjugate base of phenol?
The conjugate base of phenol is phenoxide ion (C6H5O-). When phenol loses a proton (H+), it forms this negatively charged species that is stabilized by resonance in its aromatic ring structure.
Delta H equals delta E plus delta nRT prove?
Yes
What has the author George H Stevens written?
George H. Stevens has written: 'The manufacture of synthetic phenol from benzol by sulphonation' -- subject(s): Phenol 'Stevens' China wood oil formulary' -- subject(s): Tung-oil
What is delta S in the equation delta G delta H-T delta S?
Delta S represents the change in entropy of a system. In the equation delta G = delta H - T delta S, it is used to determine the contribution of entropy to the overall change in Gibbs free energy. A negative delta S value suggests a decrease in the disorder of a system.
What ion is produced when phenol acts as an acid?
When phenol acts as an acid, it donates a proton (H+ ion) to form the phenolate ion (C6H5O-).
What is delta h in the equation delta g delta h - t delta s?
Delta H represents the change in enthalpy of a system. In the equation ΔG = ΔH - TΔS, it is the enthalpy change of the system. It indicates the heat absorbed or released during a reaction at constant pressure.
What is delta S in the equation delta G delta H - T delta S?
The change in enthalpy between products and reactants in a reaction
Why doesn't phenol react with carbonates?
Phenol does not react with carbonates because it is a weak acid and does not release hydrogen ions (H⁺) readily enough to react with the carbonate ions (CO₃²⁻). For a reaction to occur, phenol would need to be able to donate a proton to the carbonate, which is not favorable due to phenol's low acidity compared to stronger acids. As a result, the carbonate remains unreacted in the presence of phenol.
What is the delta H for 1-propanol?
The standard enthalpy of combustion for 1-propanol is approximately -2026 kJ/mol, meaning that the heat released when 1 mol of 1-propanol is completely burned is 2026 kJ.
