Short-Question

# How do you calculate the molality of NaCl?

## How do you calculate the molality of NaCl?

Use the formula moles = mass of solute / molar mass . Assume we want to dissolve 70.128 grams of salt in 1.5 kg of water. so moles NaCl = 70.128 g / (58.44 g/mol) = 1.2 mol . Plug moles value and the mass of the solvent into the molality formula.

## How do you calculate molality from KG?

Key Concepts

1. The concentration of a solution can be given in moles of solute dissolved per kilogram of solvent.
2. Molality is given the symbol m.
3. molality = moles of solute ÷ mass of solvent in kilograms m = n(solute) ÷ mass(solvent in kg)

How do you calculate molality of a substance?

The formula for molality is m = moles of solute / kilograms of solvent.

How do you calculate kg of solvent?

Calculate the number of kilograms of solvent.

1. The mass of the solution is 1 L × (1000 mL / 1 L) × ( 1.02 g / mL) × (1 kg / 1000 g) = 1.02 kg.
2. The mass of solute is 3.00 mol glucose × (180 g glucose / 1 mol glucose) × ( 1 kg / 1000 g ) = 0.54 kg.
3. The mass of the solvent is 1.02 kg – 0.54 = 0.48 kg.

### What is the molality of a solution that contains 48 grams of sodium chloride and 0.25 kg of water?

What is the molality of solution that contains 48 g of sodium chloride and 250 ml of water? A: 3.3 m 7.

### How do you solve for molarity?

The key to calculating molarity is to remember the units of molarity (M): moles per liter….To calculate molarity:

1. Find the number of moles of solute dissolved in solution,
2. Find the volume of solution in liters, and.
3. Divide moles solute by liters solution.

What is kilograms of solvent?

Molality is a measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent. This contrasts with the definition of molarity which is based on a specified volume of solution. A commonly used unit for molality in chemistry is mol/kg.

How do you calculate molar mass from molality?

Use the freeing point depression (ΔTf) to calculate the molality of the solution. Then use the molality equation to calculate the moles of solute. Then divide the grams of solute by the moles to determine the molar mass.

## How to calculate the molality of NaCl solution?

Divide 1.2 mol by 1.5 kg, and you’ll find out that the molality of the NaCl solution is 0.8 molal (in standard molality units: 0.8 mol/kg). Or save yourself some time and use our molality calculator (choose an advance mode to enter also the molar mass and solute mass). Hanna Pamuła, PhD candidate

## How to calculate the molality of a gram of salt?

Convert grams to moles. Use the formula moles = mass of solute / molar mass. Assume we want to dissolve 70.128 grams of salt in 1.5 kg of water. so moles NaCl = 70.128 g / (58.44 g/mol) = 1.2 mol. Plug moles value and the mass of the solvent into the molality formula.

How to change between molarity and molality in math?

To change between molarity and molality you can use the following relation: Let’s show on the example how to calculate molality: Choose your substance. Let’s assume it’s table salt – sodium chloride (NaCl). Calculate its molar mass. For sodium chloride it’s equal to 58.44 g/mol (as Na = 22.99 g/mol and Cl = 35.45 g/mol). Convert grams to moles.

Which is the formula for molality of solvent?

Molality definition and molality formula Molality, also called molal concentration, is defined as the amount of substance of solute, divided by the mass of the solvent m solvent: Molality = nsolute / m solvent = msolute / (W solute * m solvent)