Question

К 250 г 10%-го раствора сахара прилили 150 мл воды. Какова массовая доля (%) сахара в полученном растворе?

Answer 1

M (раствора) = 250г, w = 0,1
1) m (C6H12O6) = m (раствора) * w;
m(C6H12O6) = 250 *0.1= 25 г
2) m (конечного раствора) = m (раствора) + V (воды);
m (кон. раствора) = 250+150 = 400 г
3) W (сахара) = m (C6H12O6) / m (кон. раствора) *100%;
W (сахара) = 25 / 400 * 100% = 0.0625 * 100% = 6.25%

Answer 2

Calculation of the Mass Fraction of Sugar in the Solution

To calculate the mass fraction of sugar in the solution, we need to know the initial mass of the sugar and the total mass of the solution after adding water.

Given: - Initial mass of the sugar solution: 250 g - Concentration of the sugar solution: 10% - Volume of water added: 150 ml

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

Mass Fraction of Sugar (%) = (Mass of Sugar / Total Mass of Solution) * 100

Let's calculate the mass fraction of sugar in the solution step by step:

1. Calculate the mass of sugar in the solution: - Mass of sugar = Initial mass of the sugar solution * Concentration of the sugar solution - Mass of sugar = 250 g * 10% = 25 g

2. Calculate the total mass of the solution: - Total mass of the solution = Initial mass of the sugar solution + Mass of water added - Total mass of the solution = 250 g + 150 g = 400 g

3. Calculate the mass fraction of sugar: - Mass fraction of sugar = (Mass of sugar / Total mass of the solution) * 100 - Mass fraction of sugar = (25 g / 400 g) * 100 = 6.25%

Therefore, the mass fraction of sugar in the obtained solution is 6.25%.