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How do you use the Gibbs free energy equation to find the Gibbs free energy change for the oxidation of iron at 25 degrees C?
The Gibbs free energy change is calculated from the expression
Δ G = Δ H - T(Δ S)
For the oxidation of iron, assuming you mean heating iron in air, where the product is black iron oxide,
3Fe + 2O2 --> Fe3O4
you need to find the enthalpy and entropy changes, which are
Δ H (formation) = - 1118.4 kJ/mol
Δ S (formation) = - 345.5 J/mol/K
Substituting into the first equation, remembering to divide the entropy value by 1000 because it's in J per mol per kelvin, not kJ, and converting the 25 degrees C to kelvin, we get:
Δ G = -1118.4 kj - 298 (- 345.5)/1000 kJ
= - 1015.441 kJ
What else can I help you with?
How do you use the Gibbs free energy equation to find the Gibbs free energy change for the formation of ammonia at 25 degrees C?
The Gibbs free energy change is calculated from the expression Δ G = Δ H - T(Δ S) For the formation of ammonia N2 + 3H2 --> 2 NH3 you need to find the enthalpy and entropy changes, which are Δ H (formation) = - 45.92 kJ/mol Δ S (formation) = - 98.39 J/mol/K Substituting into the first equation, remembering to divide the entropy value by 1000 because it's in J per mol per kelvin, not kJ, and converting the 25 degrees C to kelvin, we get: Δ G = -45.92 kJ http://www.docbrown.info/page07/delta3SGc.htm
Is Oxidation exergonic or endergonic?
Oxidation is generally considered an exergonic process, meaning it releases energy. During oxidation, electrons are removed from a substance, often resulting in the release of energy in the form of heat or light. This energy release occurs because the products of the oxidation reaction typically have lower free energy than the reactants. Therefore, oxidation is often associated with energy-yielding reactions in biological and chemical systems.
Where a molecule gives up electrons and releases energy?
This process occurs during oxidation, where a molecule loses electrons and energy is released. Oxidation reactions are important in cellular respiration, where glucose is oxidized to release energy for the cell to use.
What is melting equation?
The melting equation describes the phase transition of a substance from solid to liquid as it absorbs heat. It typically involves the relationship between temperature and pressure, often represented in the context of the Gibbs free energy, where the change in enthalpy equals the product of temperature and change in entropy. The equation can be expressed as ( \Delta G = \Delta H - T\Delta S ), where ( \Delta G ) is the change in Gibbs free energy, ( \Delta H ) is the change in enthalpy, and ( \Delta S ) is the change in entropy. At the melting point, the Gibbs free energy change is zero, indicating equilibrium between the solid and liquid phases.
Where is the mass found in chemical change?
In the energy because of Einsteins equation: E=mc^2. In a chemical change, mass is converted to energy because of the loss in strong forces and weak forces in molecules.
Describe the energy change when magneium burns?
Oxidation occurs
What is the equation for meausuring the change in thermal energy?
The equation for measuring the change in thermal energy is: Q = mcΔT, where Q is the change in thermal energy, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
What does delta mean in the equation for thermal energy?
Delta in the equation for thermal energy typically represents a change or difference, such as a change in temperature or heat energy. It signifies the final state of the system minus the initial state to calculate the thermal energy change.
What is the equation for the change in thermal energy in a system?
The equation for the change in thermal energy in a system is Q mcT, where Q represents the change in thermal energy, m is the mass of the system, c is the specific heat capacity of the material, and T is the change in temperature.
The change in energy represented by a thermochemical equation is always?
The change in energy represented by a thermochemical equation is always given in units of energy, typically kilojoules (kJ) or kilocalories (kcal), and can be either exothermic (releasing heat) or endothermic (absorbing heat).
What is the relationship between entropy and free energy in thermodynamics?
In thermodynamics, entropy and free energy are related through the equation G H - TS, where G is the change in free energy, H is the change in enthalpy, T is the temperature in Kelvin, and S is the change in entropy. This equation shows that the change in free energy is influenced by both the change in enthalpy and the change in entropy.
What is an equation for work energy theorem?
The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. Mathematically, the equation can be written as W = ΔKE, where W is the work done on the object and ΔKE is the change in its kinetic energy.
Using the Gibbs free energy equation what is the temperature range for which the oxidation of lead is spontaneous?
The reaction is spontaneous below 554.8/0.1975 K.
Oxidizing food for energy-physical change?
When food is oxidized for energy in the body, it undergoes a chemical change rather than a physical change. Oxidation involves the breaking down of molecules to release energy, which is a fundamental process in our metabolism. This process transforms the chemical energy stored in food molecules into a form that the body can use for various biological functions.
What is the equation to work out the amount of energy needed to change state?
The equation to calculate the amount of energy needed to change state is: Q = m * L, where Q is the energy needed, m is the mass of the substance, and L is the specific latent heat of the substance.
What equation is used to calculate the free energy change of a reaction?
The equation used to calculate the free energy change of a reaction is ΔG = ΔH - TΔS, where ΔG is the change in free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.
How do you calculate displacement of an object using the work-energy equation?
To calculate displacement using the work-energy equation, first calculate the work done on the object using the force applied and the distance moved. Then, equate the work done to the change in kinetic energy of the object using the work-energy equation: Work = Change in kinetic energy = 0.5 * mass * (final velocity^2 - initial velocity^2). Finally, rearrange the equation to solve for displacement.
