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K J Somaiya College of science (K J Somaiya), Mumbai
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## Molality if ionic activity and activity coefficient are given Solution

STEP 0: Pre-Calculation Summary
Formula Used
molality = Ionic activity/Activity coefficient
m = a/γ
This formula uses 2 Variables
Variables Used
Ionic activity - The Ionic activity is the measure of the effective concentration of a molecule or ionic species (Measured in Mole per Kilogram)
Activity coefficient- Activity coefficient is a factor used in thermodynamics to account for deviations from ideal behaviour in a mixture of chemical substances.
STEP 1: Convert Input(s) to Base Unit
Ionic activity: 0.5 Mole per Kilogram --> 0.5 Mole per Kilogram No Conversion Required
Activity coefficient: 0.1 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
m = a/γ --> 0.5/0.1
Evaluating ... ...
m = 5
STEP 3: Convert Result to Output's Unit
5 Mole per Kilogram --> No Conversion Required
5 Mole per Kilogram <-- Molality
(Calculation completed in 00.000 seconds)

## < 11 Other formulas that you can solve using the same Inputs

Fugacity coefficient using Gamma/ phi formulation of VLE
fugacity_coefficient = (Mole fraction of component in liquid phase*Activity coefficient*Saturated pressure)/(Mole fraction of component in vapour phase*Total pressure) Go
Saturated pressure using Gamma/ phi formulation of VLE
saturated_pressure = (Mole fraction of component in vapour phase*Fugacity coefficient*Total pressure)/(Mole fraction of component in liquid phase*Activity coefficient) Go
Total pressure using Gamma/ phi formulation of VLE
total_pressure = (Mole fraction of component in liquid phase*Activity coefficient*Saturated pressure)/(Mole fraction of component in vapour phase*Fugacity coefficient) Go
Vapour phase mole fraction using Gamma/ phi formulation of VLE
mole_fraction_of_component_vapour_phase = (Mole fraction of component in liquid phase*Activity coefficient*Saturated pressure)/(Fugacity coefficient*Total pressure) Go
Liquid phase mole fraction using Gamma/ phi formulation of VLE
mole_fraction_of_component_liquid_phase = (Mole fraction of component in vapour phase*Fugacity coefficient*Total pressure)/(Activity coefficient*Saturated pressure) Go
Saturated pressure using Modified Raoult's Law in VLE
saturated_pressure = (Mole fraction of component in vapour phase*Total pressure)/(Mole fraction of component in liquid phase*Activity coefficient) Go
Total pressure using Modified Raoult's Law in VLE
total_pressure = (Mole fraction of component in liquid phase*Activity coefficient*Saturated pressure)/Mole fraction of component in vapour phase Go
Liquid phase mole fraction using Modified Raoult's Law in VLE
mole_fraction_of_component_liquid_phase = (Mole fraction of component in vapour phase*Total pressure)/(Activity coefficient*Saturated pressure) Go
Vapour phase mole fraction using Modified Raoult's Law in VLE
mole_fraction_of_component_vapour_phase = (Mole fraction of component in liquid phase*Activity coefficient*Saturated pressure)/Total pressure Go
Fugacity coefficient of a component using K-value expression for Gamma/ phi formulation
fugacity_coefficient = (Activity coefficient*Saturated Pressure)/(K value*Pressure) Go
K- value of a component using Gamma/ phi formulation
k_value = (Activity coefficient*Saturated Pressure)/(Fugacity coefficient*Pressure) Go

## < 11 Other formulas that calculate the same Output

Molality using Relative Lowering Of Vapour Pressure
molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent) Go
Molality Using Molarity
molality = (Molarity*1000)/(Density*1000-Molarity*Molar Mass of the Solute) Go
Molaity Using Mole Fraction
molality = (Mole Fraction Of Solute*1000)/(Mole Fraction Of Solvent*Molar Mass Of The Solvent) Go
Molality when Elevation in Boiling Point is given
molality = Elevation in Boiling Point/(Van't Hoff Factor*Ebullioscopic constant of solvent) Go
Molality when Depression in Freezing Point is given
molality = Depression in Freezing Point/(Cryoscopic Constant*Van't Hoff Factor) Go
Molality when Boiling Point Elevation and Constant are Given
molality = Boiling Point Elevation/Molal Boiling Point Elevation Constant Go
Molality
molality = Number of Moles of Solute/Solvent Present in Solution per Kg Go
Molality when Freezing Point Depression is Given
molality = Freezing point depression/Molal freezing point constant Go
Molality
molality = Number of Moles of Solute/Mass Of Solvent Go
Molarity of bi-bivalent electrolyte if ionic strength is given
molality = (Ionic strength/4) Go
Molarity of uni-bivalent electrolyte if ionic strength is given
molality = Ionic strength/3 Go

### Molality if ionic activity and activity coefficient are given Formula

molality = Ionic activity/Activity coefficient
m = a/γ

## What is Ionic activity?

The deviation from ideality of a solute particle-(In this case solute behaves as a completely dissociated system, that is strong electrolyte) can be expressed in terms of solute activity, denoted by the letter ‘a’. Activity is defined as a measure of the effective concentration of a molecule or ionic species. Activity depends on the temperature, pressure and composition of the mixture of species. Activity of a solute depends on its concentration, being proportional to concentration at sufficient dilution.

## How to Calculate Molality if ionic activity and activity coefficient are given?

Molality if ionic activity and activity coefficient are given calculator uses molality = Ionic activity/Activity coefficient to calculate the Molality, The Molality if ionic activity and activity coefficient are given formula is defined as the ratio of the ionic activity to the activity coefficient of the electrolyte. Molality and is denoted by m symbol.

How to calculate Molality if ionic activity and activity coefficient are given using this online calculator? To use this online calculator for Molality if ionic activity and activity coefficient are given, enter Ionic activity (a) and Activity coefficient (γ) and hit the calculate button. Here is how the Molality if ionic activity and activity coefficient are given calculation can be explained with given input values -> 5 = 0.5/0.1.

### FAQ

What is Molality if ionic activity and activity coefficient are given?
The Molality if ionic activity and activity coefficient are given formula is defined as the ratio of the ionic activity to the activity coefficient of the electrolyte and is represented as m = a/γ or molality = Ionic activity/Activity coefficient. The Ionic activity is the measure of the effective concentration of a molecule or ionic species and Activity coefficient is a factor used in thermodynamics to account for deviations from ideal behaviour in a mixture of chemical substances.
How to calculate Molality if ionic activity and activity coefficient are given?
The Molality if ionic activity and activity coefficient are given formula is defined as the ratio of the ionic activity to the activity coefficient of the electrolyte is calculated using molality = Ionic activity/Activity coefficient. To calculate Molality if ionic activity and activity coefficient are given, you need Ionic activity (a) and Activity coefficient (γ). With our tool, you need to enter the respective value for Ionic activity and Activity coefficient 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 Molality?
In this formula, Molality uses Ionic activity and Activity coefficient. We can use 11 other way(s) to calculate the same, which is/are as follows -
• molality = Number of Moles of Solute/Solvent Present in Solution per Kg
• molality = (Mole Fraction Of Solute*1000)/(Mole Fraction Of Solvent*Molar Mass Of The Solvent)
• molality = (Molarity*1000)/(Density*1000-Molarity*Molar Mass of the Solute)
• molality = Boiling Point Elevation/Molal Boiling Point Elevation Constant
• molality = Freezing point depression/Molal freezing point constant
• molality = Number of Moles of Solute/Mass Of Solvent
• molality = Depression in Freezing Point/(Cryoscopic Constant*Van't Hoff Factor)
• molality = Elevation in Boiling Point/(Van't Hoff Factor*Ebullioscopic constant of solvent)
• molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent)
• molality = (Ionic strength/4)
• molality = Ionic strength/3
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