Question

раствора 20 грамм соли растворили в 80 граммах воды определите массовую долю растворенного вещества в растворе

Answer 1

Ω=m соли÷(m соли+m вода)=20÷(20+80) *100
ω=20%

Answer 2

Calculation of Mass Fraction of Solvent in Solution

To determine the mass fraction of the dissolved substance in the solution, we need to calculate the mass of the solvent and the mass of the solute.

Given: - Mass of solute (salt) = 20 grams - Mass of solvent (water) = 80 grams

To calculate the mass fraction of the solute, we can use the formula:

Mass Fraction of Solute = (Mass of Solute / Total Mass of Solution) * 100

To calculate the mass fraction of the solvent, we can use the formula:

Mass Fraction of Solvent = (Mass of Solvent / Total Mass of Solution) * 100

Let's calculate the mass fraction of the solute and the solvent.

Mass of Solute: - Mass of salt = 20 grams

Mass of Solvent: - Mass of water = 80 grams

Total Mass of Solution: - Total mass of solution = Mass of solute + Mass of solvent = 20 grams + 80 grams = 100 grams

Mass Fraction of Solute: - Mass Fraction of Solute = (Mass of Solute / Total Mass of Solution) * 100 - Mass Fraction of Solute = (20 grams / 100 grams) * 100 - Mass Fraction of Solute = 20%

Mass Fraction of Solvent: - Mass Fraction of Solvent = (Mass of Solvent / Total Mass of Solution) * 100 - Mass Fraction of Solvent = (80 grams / 100 grams) * 100 - Mass Fraction of Solvent = 80%

Therefore, the mass fraction of the solute (salt) in the solution is 20%, and the mass fraction of the solvent (water) in the solution is 80%.