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National Institute of Technology, Meghalaya (NIT), Meghalaya
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National Institute of Information Technology (NIIT), Neemrana
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## Molality using Relative Lowering Of Vapour Pressure Solution

STEP 0: Pre-Calculation Summary
Formula Used
molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent)
m = ((PoA-PA)*1000)/(M*PoA)
This formula uses 3 Variables
Variables Used
Vapour Pressure of Pure Solvent - The Vapour Pressure of Pure Solvent is the vapour pressure of solvent prior to addition of solute. (Measured in Pascal)
Vapour Pressure of Solvent in Solution - The Vapour Pressure of Solvent in Solution is the vapour pressure of solvent post addition of solute. (Measured in Pascal)
Molecular Mass Solvent - The Molecular Mass Solvent is sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses. (Measured in Gram)
STEP 1: Convert Input(s) to Base Unit
Vapour Pressure of Pure Solvent: 20000 Pascal --> 20000 Pascal No Conversion Required
Vapour Pressure of Solvent in Solution: 15000 Pascal --> 15000 Pascal No Conversion Required
Molecular Mass Solvent: 25 Gram --> 0.025 Kilogram (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
m = ((PoA-PA)*1000)/(M*PoA) --> ((20000-15000)*1000)/(0.025*20000)
Evaluating ... ...
m = 10000
STEP 3: Convert Result to Output's Unit
10000 Mole per Kilogram --> No Conversion Required
10000 Mole per Kilogram <-- Molality
(Calculation completed in 00.000 seconds)

## < 10+ Relative Lowering of Vapour Pressure Calculators

Molecular Mass of solute using Relative Lowering Of Vapour Pressure
molecular_mass_solute = (Weight of solute*Molecular Mass Solvent*Vapour Pressure of Pure Solvent)/((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Weight of solvent) Go
Weight of solvent using Relative Lowering Of Vapour Pressure
weight_of_solvent = (Vapour Pressure of Pure Solvent*Weight of solute*Molecular Mass Solvent)/((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Molecular Mass Solute) Go
Weight of solute using Relative Lowering Of Vapour Pressure
weight_of_solute = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Weight of solvent*Molecular Mass Solute)/(Vapour Pressure of Pure Solvent*Molecular Mass Solvent) Go
Moles of solvent in dilute solution using Relative Lowering Of Vapour Pressure
number_of_moles_of_solvent = (Number of Moles of Solute*Vapour Pressure of Pure Solvent)/(Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution) Go
Moles of solute in dilute solution using Relative Lowering Of Vapour Pressure
number_of_moles_of_solute = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Number of Moles of Solvent)/Vapour Pressure of Pure Solvent Go
Molecular Mass of solvent using Relative Lowering Of Vapour Pressure
molecular_mass_solvent = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molality*Vapour Pressure of Pure Solvent) Go
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
Relative Lowering Of Vapour Pressure
relative_lowering_of_vapour_pressure = (Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)/Vapour Pressure of Pure Solvent Go
Mole Fraction of solute in terms of Vapour Pressure
mole_fraction_solute = (Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)/Vapour Pressure of Pure Solvent Go
Mole Fraction of solvent in terms of Vapour Pressure
mole_fraction_solvent = Vapour Pressure of Solvent in Solution/Vapour Pressure of Pure Solvent Go

### Molality using Relative Lowering Of Vapour Pressure Formula

molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent)
m = ((PoA-PA)*1000)/(M*PoA)

## What causes the Relative Lowering Of Vapour Pressure?

This lowering in vapour pressure is due to the fact that after the solute was added to the pure liquid (solvent), the liquid surface now had molecules of both, the pure liquid and the solute. The number of solvent molecules escaping into vapour phase gets reduced and as a result the pressure exerted by the vapour phase is also reduced. This is known as relative lowering of vapour pressure. This decrease in vapour pressure depends on the amount of non-volatile solute added in the solution irrespective of its nature and hence it is one of the colligative properties.

## How to Calculate Molality using Relative Lowering Of Vapour Pressure?

Molality using Relative Lowering Of Vapour Pressure calculator uses molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent) to calculate the Molality, The Molality using Relative Lowering Of Vapour Pressure is a property of a solution and is defined as the number of moles of solute per kilogram of solvent. Molality and is denoted by m symbol.

How to calculate Molality using Relative Lowering Of Vapour Pressure using this online calculator? To use this online calculator for Molality using Relative Lowering Of Vapour Pressure, enter Vapour Pressure of Pure Solvent (PoA), Vapour Pressure of Solvent in Solution (PA) and Molecular Mass Solvent (M) and hit the calculate button. Here is how the Molality using Relative Lowering Of Vapour Pressure calculation can be explained with given input values -> 10000 = ((20000-15000)*1000)/(0.025*20000).

### FAQ

What is Molality using Relative Lowering Of Vapour Pressure?
The Molality using Relative Lowering Of Vapour Pressure is a property of a solution and is defined as the number of moles of solute per kilogram of solvent and is represented as m = ((PoA-PA)*1000)/(M*PoA) or molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent). The Vapour Pressure of Pure Solvent is the vapour pressure of solvent prior to addition of solute, The Vapour Pressure of Solvent in Solution is the vapour pressure of solvent post addition of solute and The Molecular Mass Solvent is sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses.
How to calculate Molality using Relative Lowering Of Vapour Pressure?
The Molality using Relative Lowering Of Vapour Pressure is a property of a solution and is defined as the number of moles of solute per kilogram of solvent is calculated using molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent). To calculate Molality using Relative Lowering Of Vapour Pressure, you need Vapour Pressure of Pure Solvent (PoA), Vapour Pressure of Solvent in Solution (PA) and Molecular Mass Solvent (M). With our tool, you need to enter the respective value for Vapour Pressure of Pure Solvent, Vapour Pressure of Solvent in Solution and Molecular Mass Solvent 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 Vapour Pressure of Pure Solvent, Vapour Pressure of Solvent in Solution and Molecular Mass Solvent. We can use 10 other way(s) to calculate the same, which is/are as follows -
• relative_lowering_of_vapour_pressure = (Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)/Vapour Pressure of Pure Solvent
• mole_fraction_solute = (Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)/Vapour Pressure of Pure Solvent
• mole_fraction_solvent = Vapour Pressure of Solvent in Solution/Vapour Pressure of Pure Solvent
• molecular_mass_solvent = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molality*Vapour Pressure of Pure Solvent)
• molality = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*1000)/(Molecular Mass Solvent*Vapour Pressure of Pure Solvent)
• molecular_mass_solute = (Weight of solute*Molecular Mass Solvent*Vapour Pressure of Pure Solvent)/((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Weight of solvent)
• weight_of_solute = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Weight of solvent*Molecular Mass Solute)/(Vapour Pressure of Pure Solvent*Molecular Mass Solvent)
• weight_of_solvent = (Vapour Pressure of Pure Solvent*Weight of solute*Molecular Mass Solvent)/((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Molecular Mass Solute)
• number_of_moles_of_solute = ((Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)*Number of Moles of Solvent)/Vapour Pressure of Pure Solvent
• number_of_moles_of_solvent = (Number of Moles of Solute*Vapour Pressure of Pure Solvent)/(Vapour Pressure of Pure Solvent-Vapour Pressure of Solvent in Solution)
Where is the Molality using Relative Lowering Of Vapour Pressure calculator used?
Among many, Molality using Relative Lowering Of Vapour Pressure calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
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