Question

глюкозу, кількістю речовини 0.5 моль розчинили у 410 мл води. Яка масова частка розчиненої речовини. Даю 20 баллов

Answer 1

Объяснение:

m(C6H12O6)=М•n=0.5•180=90г

w(C6H12O6)= m(C6H12O6)•100%/(m(C6H12O6)+m(H2O))= 90•100%/(90+410)=18%

Answer 2

Calculating the Mass Fraction of the Solute in the Solution

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

Mass Fraction = (Mass of Solute / Total Mass of Solution) x 100%

Given: - Amount of substance (moles) of the solute (glucose) = 0.5 mol - Volume of the solution = 410 mL

First, we need to convert the volume of the solution from milliliters to liters: 410 mL = 0.41 L

Next, we can calculate the mass of the solute using its molar mass, which is approximately 180.16 g/mol for glucose.

Calculating the Mass of the Solute: ``` Mass of Solute = Amount of Substance (moles) x Molar Mass Mass of Solute = 0.5 mol x 180.16 g/mol Mass of Solute ≈ 90.08 g ```

Now, we can calculate the total mass of the solution by considering the mass of the solute and the mass of the solvent (water).

Calculating the Total Mass of the Solution: ``` Total Mass of Solution = Mass of Solute + Mass of Solvent Total Mass of Solution = 90.08 g (solute) + 410 g (water) Total Mass of Solution = 500.08 g ```

Finally, we can calculate the mass fraction of the solute in the solution using the formula mentioned earlier.

Calculating the Mass Fraction: ``` Mass Fraction = (Mass of Solute / Total Mass of Solution) x 100% Mass Fraction = (90.08 g / 500.08 g) x 100% Mass Fraction ≈ 18.01% ```

Answer:

The mass fraction of the solute (glucose) in the solution is approximately 18.01%.