Question

1. В 80 г воды растворили 20 г кислоты. Вычислите массу полученного раствора и массовую долю растворенного вещества в растворе.​

Answer 1

Масса раствора равна:

m(p-p) = m(в-во) + m(Н₂О) = 20 + 80 = 100 г

Массовая доля вещества в растворе:

ω = [m(в-во)/m(p-p)] * 100 = (20/100)*100 = 20%

Answer 2

Calculating the Mass of the Solution and the Mass Fraction of the Solute

To calculate the mass of the solution and the mass fraction of the solute in the solution, we can use the following formulas:

1. Mass of the Solution (m_solution): - This can be calculated by adding the mass of the solvent (water) to the mass of the solute (acid). - \( m_{solution} = m_{solute} + m_{solvent} \)

2. Mass Fraction of the Solute (w_solute): - This can be calculated by dividing the mass of the solute by the mass of the solution and then multiplying by 100 to express it as a percentage. - \( w_{solute} = \frac{m_{solute}}{m_{solution}} \times 100\% \)

Calculation

Given: - Mass of the solute (acid) = 20 g - Mass of the solvent (water) = 80 g

1. Mass of the Solution (m_solution): - \( m_{solution} = 20 \, \text{g (solute)} + 80 \, \text{g (solvent)} = 100 \, \text{g} \)

2. Mass Fraction of the Solute (w_solute): - \( w_{solute} = \frac{20 \, \text{g (solute)}}{100 \, \text{g (solution)}} \times 100\% = 20\% \)

Therefore, the mass of the solution is 100 g, and the mass fraction of the solute in the solution is 20%.

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I hope this helps! If you have further questions or need additional assistance, feel free to ask!