Molarity is the no of moles of solute per dm3 solution, the temperature change changes the volume so molarity becomes effected.
Mol is a cocentration unit !
Molality (m) is calculated by dividing the number of moles of solute by the mass of the solvent in kilograms and is expressed in mol/kg. The formula for molality is: [ molality (m) = \frac{moles\ of\ solute}{mass\ of\ solvent\ in\ kg} ]
I think you are asking about the following formula: ΔT = Kf m i where ΔT is the change in freezing point, Kf is a constant dependent on the identity of the substance, m is the molality (the kilograms of solute per liters of solvent), and i is the Van't Hoff number (the number of particles that each formula unit of the solute breaks up into).
Molality is moles solute per kilograms of solvent, so 2/10=0.2m.
The molality is 5,54.
Molality is used when temperature varies in an exothermic or endothermic reaction because it is not dependent on temperature or pressure. Molality does not depend on tempratute whereas molarity does.
The relationship between the molar mass and molality of a solution is that the molality of a solution is dependent on the molar mass of the solute. Molality is calculated by dividing the number of moles of solute by the mass of the solvent in kilograms. Therefore, the molar mass of the solute directly affects the molality of the solution.
The difference is in the denominators.Molarity (M) - the number of moles of solute divided by the number of liters of solution.Molality(m) - the number of moles of solute divided by the number of kilograms of solvent.
Molality is used for calculations instead of molarity because it is a more accurate measure of concentration. Molarity can change with temperature, while molality remains constant. This makes molality more reliable for certain calculations, especially those involving changes in temperature.
Molality is independent of temperature, so when you are trying to find changes in boiling and freezing points you need something that will stay constant regardless of the change in temperature. Molarity is temperature dependent and also is based on the volume of a solution, both of which are needed to calculate pressure using the ideal gas law, PV=nRT. Osmotic pressure is similar but we substitute the number of moles of the solution and the volume by using the molarity, you cannot do this with molality, since it is dependent on mass, not volume.
Molality is a measure of solute concentration in a solution expressed as the number of moles of solute per kilogram of solvent. It is often used in place of molarity for concentrated solutions or when temperature changes significantly. Molality accounts for changes in volume due to temperature, making it a more reliable measure of concentration in some cases.
To determine the molality of a solution using the freezing point depression method, you need to measure the freezing point of the pure solvent and the freezing point of the solution. By comparing the two freezing points, you can calculate the change in temperature. Using the formula T Kf m, where T is the change in temperature, Kf is the cryoscopic constant of the solvent, and m is the molality of the solution, you can solve for the molality of the solution.
Molality of a solution remains constant as mass of a solution independent of temperature.
Molarity is better than molality for many applications because it is more commonly used and easily measured in the laboratory. Additionally, molarity accounts for volume changes with temperature, whereas molality does not. This makes molarity more versatile for a wider range of experimental conditions.
volume or temperature
To calculate the molality of a solution, you divide the moles of solute by the mass of the solvent in kilograms. The formula for molality is: Molality (m) moles of solute / mass of solvent (in kg).
To determine the molar mass from molality, you can use the formula: Molar mass (molality x molar mass of solvent) / molality of solute. This equation helps you calculate the molar mass of a substance based on its molality in a solution.