Standard Enthalpy of Reaction at Equilibrium Calculator

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Thermodynamics in Chemical Equilibrium

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Relationship between Different Equilibrium Constants

✖Temperature is the degree or intensity of heat present in a substance or object.ⓘ Temperature [T]			+10% -10%
✖Change in entropy is the thermodynamic quantity equivalent to the total difference between the entropy of a system.ⓘ Change in Entropy [ΔS]			+10% -10%
✖Equilibrium Constant is the value of its reaction quotient at chemical equilibrium.ⓘ Equilibrium Constant [K_c]			+10% -10%

✖Change in enthalpy is the thermodynamic quantity equivalent to the total difference between the heat content of a system.ⓘ Standard Enthalpy of Reaction at Equilibrium [ΔH]

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Formula

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Standard Enthalpy of Reaction at Equilibrium

Formula

`"ΔH" = ("T"*"ΔS")-(2.303*"[R]"*"T"*log10("K"_{"c"}))`

Example

`"10923.09J/kg"=("85K"*"220J/kg*K")-(2.303*"[R]"*"85K"*log10("60mol/L"))`

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Standard Enthalpy of Reaction at Equilibrium Solution

STEP 0: Pre-Calculation Summary

Formula Used

Change in Enthalpy = (Temperature*Change in Entropy)-(2.303*[R]*Temperature*log10(Equilibrium Constant))
ΔH = (T*ΔS)-(2.303*[R]*T*log10(K_c))
This formula uses 1 Constants, 1 Functions, 4 Variables

Constants Used

[R] - Universal gas constant Value Taken As 8.31446261815324

Functions Used

log10 - The common logarithm, also known as the base-10 logarithm or the decimal logarithm, is a mathematical function that is the inverse of the exponential function., log10(Number)

Variables Used

Change in Enthalpy - (Measured in Joule per Kilogram) - Change in enthalpy is the thermodynamic quantity equivalent to the total difference between the heat content of a system.
Temperature - (Measured in Kelvin) - Temperature is the degree or intensity of heat present in a substance or object.
Change in Entropy - (Measured in Joule per Kilogram K) - Change in entropy is the thermodynamic quantity equivalent to the total difference between the entropy of a system.
Equilibrium Constant - (Measured in Mole per Cubic Meter) - Equilibrium Constant is the value of its reaction quotient at chemical equilibrium.

STEP 1: Convert Input(s) to Base Unit

Temperature: 85 Kelvin --> 85 Kelvin No Conversion Required
Change in Entropy: 220 Joule per Kilogram K --> 220 Joule per Kilogram K No Conversion Required
Equilibrium Constant: 60 Mole per Liter --> 60000 Mole per Cubic Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ΔH = (T*ΔS)-(2.303*[R]*T*log10(K_c)) --> (85*220)-(2.303*[R]*85*log10(60000))

Evaluating ... ...

ΔH = 10923.0923499704

STEP 3: Convert Result to Output's Unit

10923.0923499704 Joule per Kilogram --> No Conversion Required

FINAL ANSWER

10923.0923499704 ≈ 10923.09 Joule per Kilogram <-- Change in Enthalpy

(Calculation completed in 00.004 seconds)

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Created by Akshada Kulkarni

National Institute of Information Technology (NIIT), Neemrana

Akshada Kulkarni has created this Calculator and 500+ more calculators!

Verified by Prerana Bakli

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

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< 25 Thermodynamics in Chemical Equilibrium Calculators

Equilibrium Constant 2 in Temperature Range T1 and T2

Go Equilibrium constant 2 = Equilibrium constant 1*exp((Change in Enthalpy/[R])*((Final Temperature at Equilibrium-Initial Temperature at Equilibrium)/(Initial Temperature at Equilibrium*Final Temperature at Equilibrium)))

Equilibrium Constant 1 in Temperature Range T1 and T2

Go Equilibrium constant 1 = Equilibrium constant 2/exp((Change in Enthalpy/[R])*((Final Temperature at Equilibrium-Initial Temperature at Equilibrium)/(Initial Temperature at Equilibrium*Final Temperature at Equilibrium)))

Standard Enthalpy at Initial Temperature T1

Go Change in Enthalpy = (2.303*[R]*Initial Temperature at Equilibrium)*((Change in Entropy/(2.303*[R]))-log10(Equilibrium constant 1))

Standard Enthalpy at Final Temperature T2

Go Change in Enthalpy = (2.303*[R]*Final Temperature at Equilibrium)*((Change in Entropy/(2.303*[R]))-log10(Equilibrium constant 2))

Standard Entropy Change at Final Temperature T2

Go Change in Entropy = (2.303*[R])*(Change in Enthalpy/(2.303*[R]*Final Temperature at Equilibrium)+log10(Equilibrium constant 2))

Standard Enthalpy of Reaction at Equilibrium

Go Change in Enthalpy = (Temperature*Change in Entropy)-(2.303*[R]*Temperature*log10(Equilibrium Constant))

Standard Entropy Change at Equilibrium

Go Change in Entropy = (Change in Enthalpy+(2.303*[R]*Temperature*log10(Equilibrium Constant)))/Temperature

Equilibrium Constant at Initial Temperature T1

Go Equilibrium constant 1 = 10^((-Change in Enthalpy/(2.303*[R]*Initial Temperature at Equilibrium))+(Change in Entropy/(2.303*[R])))

Equilibrium Constant at Final Temperature T2

Go Equilibrium constant 2 = 10^((-Change in Enthalpy/(2.303*[R]*Final Temperature at Equilibrium))+Change in Entropy/(2.303*[R]))

Standard Entropy Change at Initial Temperature T1

Go Change in Entropy = (2.303*[R]*log10(Equilibrium constant 1))+(Change in Enthalpy/Initial Temperature at Equilibrium)

Equilibrium Constant at Equilibrium

Go Equilibrium Constant = 10^((-Change in Enthalpy+(Change in Entropy*Temperature))/(2.303*[R]*Temperature))

Equilibrium Constant due to Pressure Given Gibbs Energy

Go Equilibrium Constant for Partial Pressure = exp(-(Gibbs Free Energy/(2.303*[R]*Temperature)))

Temperature of Reaction given Equilibrium Constant of Pressure and Gibbs Energy

Go Temperature = Gibbs Free Energy/(-2.303*[R]*ln(Equilibrium Constant for Partial Pressure))

Gibbs Free Energy given Equilibrium Constant due to Pressure

Go Gibbs Free Energy = -2.303*[R]*Temperature*ln(Equilibrium Constant for Partial Pressure)

Temperature of Reaction given Equilibrium Constant and Gibbs Energy

Go Temperature = Gibbs Free Energy/(-2.303*[R]*log10(Equilibrium Constant))

Gibbs Free Energy given Equilibrium Constant

Go Gibbs Free Energy = -2.303*[R]*Temperature*log10(Equilibrium Constant)

Equilibrium Constant at Equilibrium given Gibbs Energy

Go Equilibrium Constant = exp(-(Gibbs Free Energy/([R]*Temperature)))

Equilibrium constant given Gibbs free energy

Go Equilibrium Constant = 10^(-(Gibbs Free Energy/(2.303*[R]*Temperature)))

Temperature of Reaction given Standard Enthalpy and Entropy Change

Go Temperature = (Change in Enthalpy-Gibbs Free Energy)/Change in Entropy

Standard Enthalpy of Reaction given Gibbs Free Energy

Go Change in Enthalpy = Gibbs Free Energy+(Temperature*Change in Entropy)

Standard Entropy Change given Gibbs Free Energy

Go Change in Entropy = (Change in Enthalpy-Gibbs Free Energy)/Temperature

Gibbs Free Energy given Standard Enthalpy

Go Gibbs Free Energy = Change in Enthalpy-(Temperature*Change in Entropy)

Gibbs Energy of Reactants

Go Gibbs Free Energy Reactants = Gibbs Free Energy Products-Gibbs Free Energy Reaction

Gibbs Energy of Reaction

Go Gibbs Free Energy Reaction = Gibbs Free Energy Products-Gibbs Free Energy Reactants

Gibbs Energy of Products

Go Gibbs Free Energy Products = Gibbs Free Energy Reaction+Gibbs Free Energy Reactants

Standard Enthalpy of Reaction at Equilibrium Formula

Change in Enthalpy = (Temperature*Change in Entropy)-(2.303*[R]*Temperature*log10(Equilibrium Constant))
ΔH = (T*ΔS)-(2.303*[R]*T*log10(K_c))

How equilibrium constant changes with respect to the Gibbs free energy?

1. When ΔG0 = 0, then, Kc = 1

2. When, ΔG0 > 0, i.e. positive, then Kc < 1, in this case reverse reaction is feasible showing thereby a less concentration of products at equilibrium rate.

3. When ΔG0 < 0, i.e. negative, then, Kc > 1; In this case, forward reaction is feasible showing thereby a large concentrations of product at equilibrium state.

How to Calculate Standard Enthalpy of Reaction at Equilibrium?

Standard Enthalpy of Reaction at Equilibrium calculator uses Change in Enthalpy = (Temperature*Change in Entropy)-(2.303*[R]*Temperature*log10(Equilibrium Constant)) to calculate the Change in Enthalpy, The Standard enthalpy of reaction at equilibrium formula is defined as the difference in enthalpy between products and reactants of a chemical reaction. Change in Enthalpy is denoted by ΔH symbol.

How to calculate Standard Enthalpy of Reaction at Equilibrium using this online calculator? To use this online calculator for Standard Enthalpy of Reaction at Equilibrium, enter Temperature (T), Change in Entropy (ΔS) & Equilibrium Constant (K_c) and hit the calculate button. Here is how the Standard Enthalpy of Reaction at Equilibrium calculation can be explained with given input values -> 10923.09 = (85*220)-(2.303*[R]*85*log10(60000)).

FAQ

What is Standard Enthalpy of Reaction at Equilibrium?

The Standard enthalpy of reaction at equilibrium formula is defined as the difference in enthalpy between products and reactants of a chemical reaction and is represented as ΔH = (T*ΔS)-(2.303*[R]*T*log10(K_c)) or Change in Enthalpy = (Temperature*Change in Entropy)-(2.303*[R]*Temperature*log10(Equilibrium Constant)). Temperature is the degree or intensity of heat present in a substance or object, Change in entropy is the thermodynamic quantity equivalent to the total difference between the entropy of a system & Equilibrium Constant is the value of its reaction quotient at chemical equilibrium.

How to calculate Standard Enthalpy of Reaction at Equilibrium?

The Standard enthalpy of reaction at equilibrium formula is defined as the difference in enthalpy between products and reactants of a chemical reaction is calculated using Change in Enthalpy = (Temperature*Change in Entropy)-(2.303*[R]*Temperature*log10(Equilibrium Constant)). To calculate Standard Enthalpy of Reaction at Equilibrium, you need Temperature (T), Change in Entropy (ΔS) & Equilibrium Constant (K_c). With our tool, you need to enter the respective value for Temperature, Change in Entropy & Equilibrium Constant and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Change in Enthalpy?

In this formula, Change in Enthalpy uses Temperature, Change in Entropy & Equilibrium Constant. We can use 3 other way(s) to calculate the same, which is/are as follows -

Change in Enthalpy = Gibbs Free Energy+(Temperature*Change in Entropy)
Change in Enthalpy = (2.303*[R]*Initial Temperature at Equilibrium)*((Change in Entropy/(2.303*[R]))-log10(Equilibrium constant 1))
Change in Enthalpy = (2.303*[R]*Final Temperature at Equilibrium)*((Change in Entropy/(2.303*[R]))-log10(Equilibrium constant 2))

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