Common questions

What is the criterion for the feasibility of a process?

What is the criterion for the feasibility of a process?

In its simplest terms, the two criteria to judge feasibility are cost required and value to be attained.

Is decrease in enthalpy the only criterion for spontaneity explain?

Enthalpy is the not only criterion for spontaneity. Change in the enthalpy is not only determining factor for spontaneity. The tendency of a system to acquire maximum randomness is another factor that is responsible for the spontaneity of a process and it depends on two factors: Tendency for decrease in enthalpy and.

What does it mean if enthalpy decreases?

Enthalpy is a central factor in thermodynamics. The heat that passes into or out of the system during a reaction is the enthalpy change. Whether the enthalpy of the system increases (i.e. when energy is added) or decreases (because energy is given off) is a crucial factor that determines whether a reaction can happen.

What is the criterion of the feasibility of a reaction at any temperature?

For a reaction to be feasible at a given temperature, it must happen spontaneously, which means no extra energy needs to be put in for the reaction to occur. To find out whether a reaction is feasible, you can calculate the Gibbs free energy change (ΔG) for that particular reaction.

What is sole criterion?

1 prenominal being the only one; only. 2 prenominal of or relating to one individual or group and no other. sole rights on a patent.

Is decrease in enthalpy a contributory factor for spontaneity?

Decrease in enthalpy is a contributory factor for spontaneity. Spontaneous processes are accompanied by decrease in energy and increase in randomness.

What does a decrease in enthalpy mean in a chemical reaction?

All spontaneous physical and chemical changes take place in the direction of a decrease in free energy. A spontaneous reaction may involve an increase or decrease in enthalpy, it may involve an increase or decrease in entropy, but it will always involve a decrease in free energy that is a negative ΔG.

What do enthalpy and enthalpy change mean in terms of chemical reactions and processes?

An enthalpy change is approximately equal to the difference between the energy used to break bonds in a chemical reaction and the energy gained by the formation of new chemical bonds in the reaction. It describes the energy change of a system at constant pressure. Enthalpy change is denoted by ΔH.

What is enthalpy and enthalpy change?

Enthalpy is the measurement of energy in a thermodynamic system. Enthalpy change is the sum of internal energy denoted by U and product of volume and Pressure, denoted by PV, expressed in the following manner.

Why does feasibility change with temperature?

At higher temperatures, -TΔS will become more and more negative, and will eventually outweigh the effect of ΔH. The reaction won’t be feasible at low temperatures, but if you heat it, there will be a temperature at which it becomes feasible, because ΔG becomes negative.

Which is the reaction is not feasible?

2KBr+I2⟶2KI+Br2 reaction is not possible because Br- ion is not oxidised in Br2 with I2 due to higher electrode (oxidation) potential of I2 than bromine.

What is the use of criteria?

When to use criteria: Criteria is the plural form of criterion. It refers to the rules or requirements that one will use to judge or rate something. For example: All contestants must sign a waiver and another form agreeing to the beauty pageant criteria.

Is the decrease in enthalpy a criteria for spontaneity?

A positive sign is energy gain by the system while a negative sign is energy loss by the system. Hence, enthalpy has no bearing on the spontaneity of a process. In fact, entropy change is a measure of the spontaneity of the process.

Can the energy factor be the sole criterion for predicting the feasibility of a process?

The energy factor or enthalpy factor cannot be the sole criterion for predicting the spontaneity or the feasibility of a process. Suppose the two gases are enclosed in bulbs A and B connected to each other by a tube and kept separated by a stopcock.

When is the heat given off equal to the change in the enthalpy?

1. The heat given off or absorbed when a reaction is run at constant volume is equal to the change in the internal energy of the system. 2. The heat given off or absorbed when a reaction is run at constant pressure is equal to the change in the enthalpy of the system.

How is Gibbs free energy related to enthalpy?

ΔG = ΔH – TΔS , ΔG is change in the free energy, ΔH is the change in enthalpy, ΔS is the change in entropy and T is temperature in kelvin. ΔG is commonly called Gibbs free energy. It is a measure of the stored energy in a reaction. Gibbs free energy is the amount of energy left over after a chemical reaction has taken place.

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