Entropy Change in Melting Calculator

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Spectrometric Characterization of Polymers

✖Enthalpy Change in Melting is the amount of heat evolved or absorbed in melting of crystalline polymer.ⓘ Enthalpy Change in Melting [ΔH_m]			+10% -10%
✖Melting Temperature of Polymer is the temperature at which a polymer transits from the crystalline state into the viscous flow state.ⓘ Melting Temperature of Polymer [T_m]			+10% -10%

✖Entropy Change in Melting measures the difference in entropy between the crystalline content present in crystalline polymer during melting.ⓘ Entropy Change in Melting [ΔS_m]

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Formula

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Entropy Change in Melting

Formula

`"ΔS"_{"m"} = "ΔH"_{"m"}/"T"_{"m"}`

Example

`"20J/K"="8000J"/"400K"`

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Entropy Change in Melting Solution

STEP 0: Pre-Calculation Summary

Formula Used

Entropy Change in Melting = Enthalpy Change in Melting/Melting Temperature of Polymer
ΔS_m = ΔH_m/T_m
This formula uses 3 Variables

Variables Used

Entropy Change in Melting - (Measured in Joule per Kelvin) - Entropy Change in Melting measures the difference in entropy between the crystalline content present in crystalline polymer during melting.
Enthalpy Change in Melting - (Measured in Joule) - Enthalpy Change in Melting is the amount of heat evolved or absorbed in melting of crystalline polymer.
Melting Temperature of Polymer - (Measured in Kelvin) - Melting Temperature of Polymer is the temperature at which a polymer transits from the crystalline state into the viscous flow state.

STEP 1: Convert Input(s) to Base Unit

Enthalpy Change in Melting: 8000 Joule --> 8000 Joule No Conversion Required
Melting Temperature of Polymer: 400 Kelvin --> 400 Kelvin No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ΔS_m = ΔH_m/T_m --> 8000/400

Evaluating ... ...

ΔS_m = 20

STEP 3: Convert Result to Output's Unit

20 Joule per Kelvin --> No Conversion Required

FINAL ANSWER

20 Joule per Kelvin <-- Entropy Change in Melting

(Calculation completed in 00.004 seconds)

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Home » Chemistry » Polymer Chemistry » Step-wise Polymerization » Entropy Change in Melting

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Created by Prerana Bakli

University of Hawaiʻi at Mānoa (UH Manoa), Hawaii, USA

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Verified by Torsha_Paul

University of Calcutta (CU), Kolkata

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< 14 Step-wise Polymerization Calculators

Orientation Time of Polymer

Go Orientation Time = Pre-Exponential Factor*(exp(Activation Energy/([R]*Temperature)))

Flory-Huggins Interaction Parameter

Go Flory-Huggins Interaction Parameter = (Lattice Coordination Number*Change in Enthalpy)/([R]*Temperature)

Weight Average Degree Polymerization

Go Weight Average Degree Polymerization = Weight-Average Molecular Weight/Weight Average Molecular Weight in Crosslink Site

Sample Area given Resistivity

Go Sample Area = Specific Resistance*(Thickness of Sample/Resistance)

Specific Resistance of Pellet

Go Specific Resistance = Resistance*(Pellet Area/Pellet Thickness)

Solubility Parameter given Heat of Vaporization for Nonpolar Solvents

Go Solubility Parameter = sqrt(Heat of Vaporization/Volume)

Melting Temperature of Polymer

Go Melting Temperature of Polymer = Enthalpy Change in Melting/Entropy Change in Melting

Enthalpy Change in Melting

Go Enthalpy Change in Melting = Entropy Change in Melting*Melting Temperature of Polymer

Entropy Change in Melting

Go Entropy Change in Melting = Enthalpy Change in Melting/Melting Temperature of Polymer

Total Volume of Polymer Sample

Go Total Volume of Polymer Sample = Volume Occupied by Polymer Molecules+Free Volume

Free Volume in Polymer System

Go Free Volume = Total Volume of Polymer Sample-Volume Occupied by Polymer Molecules

Volume Occupied by Polymer

Go Volume Occupied by Polymer Molecules = Total Volume of Polymer Sample-Free Volume

Heat of vaporization given Solubility Parameter

Go Heat of Vaporization = (Solubility Parameter)^2*Volume

Volume given Solubility Parameter

Go Volume = Heat of Vaporization/(Solubility Parameter)^2

Entropy Change in Melting Formula

Entropy Change in Melting = Enthalpy Change in Melting/Melting Temperature of Polymer
ΔS_m = ΔH_m/T_m

How is the Melting Point of Polymers different from Low-Molecular Substances?

The melting point is determined as the temperature at which a polymer transits from the crystalline state into the viscous flow state. In contrast to low-molecular substances, in which this process proceeds in a jump-like manner, in the case of polymers melting is observed in a temperature range. This happens due to polydispersity of polymeric chains, their branching and imperfection of crystallites formed. The equilibrium and experimental melting points are distinguished.

Why is determination of Melting Point in Polymers difficult?

The equilibrium melting point is determined by the point of the phase equilibrium between a monocrystal of the polymer and its melt. Since perfect monocrystals are difficult to obtain from the polymer, the equilibrium melting point is determined by methods of extrapolation, for example, by extrapolation of the dependence of the experimental melting point on the size of crystallites or on the molecular mass of the polymer. The melting point is a physical characteristic and is most difficult to calculate. The case in point is a calculation based on the chemical structure of the repeat unit of the polymer. Let us discuss two approaches to the solution of this problem. One of them is based on the estimation of the relation between the glass transition temperature and the melting point.

How to Calculate Entropy Change in Melting?

Entropy Change in Melting calculator uses Entropy Change in Melting = Enthalpy Change in Melting/Melting Temperature of Polymer to calculate the Entropy Change in Melting, The Entropy Change in Melting formula is defined as the ratio of enthalpy change in melting to the melting temperature in polymer. Entropy Change in Melting is denoted by ΔS_m symbol.

How to calculate Entropy Change in Melting using this online calculator? To use this online calculator for Entropy Change in Melting, enter Enthalpy Change in Melting (ΔH_m) & Melting Temperature of Polymer (T_m) and hit the calculate button. Here is how the Entropy Change in Melting calculation can be explained with given input values -> 20 = 8000/400.

FAQ

What is Entropy Change in Melting?

The Entropy Change in Melting formula is defined as the ratio of enthalpy change in melting to the melting temperature in polymer and is represented as ΔS_m = ΔH_m/T_m or Entropy Change in Melting = Enthalpy Change in Melting/Melting Temperature of Polymer. Enthalpy Change in Melting is the amount of heat evolved or absorbed in melting of crystalline polymer & Melting Temperature of Polymer is the temperature at which a polymer transits from the crystalline state into the viscous flow state.

How to calculate Entropy Change in Melting?

The Entropy Change in Melting formula is defined as the ratio of enthalpy change in melting to the melting temperature in polymer is calculated using Entropy Change in Melting = Enthalpy Change in Melting/Melting Temperature of Polymer. To calculate Entropy Change in Melting, you need Enthalpy Change in Melting (ΔH_m) & Melting Temperature of Polymer (T_m). With our tool, you need to enter the respective value for Enthalpy Change in Melting & Melting Temperature of Polymer and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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