Question

К 200 гр раствора, массовая доля (W) вещества в котором 0,3 добавили 100 гр воды. Вычислите массовую долю растворенного вещества в полученном расвторе. ПОЖАЛУЙСТА!!!!

Answer 1

M(вещества) = m(раствора)*W = 200*0,3=60 г
m(раствора) = 200+100 = 300 г
W = m(вещества)/m(раствора) = 60/300 = 0,2 или 20%

Answer 2

Calculating the Mass Fraction of the Solute in the Solution

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

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

Given: - Initial mass of the solution (200 g) - Mass fraction of the solute in the initial solution (0.3%) - Mass of water added (100 g)

First, we need to calculate the mass of the solute in the initial solution:

Mass of Solute in Initial Solution = Mass Fraction of Solute × Total Mass of Initial Solution Mass of Solute in Initial Solution = 0.3% of 200 g Mass of Solute in Initial Solution = 0.003 × 200 g Mass of Solute in Initial Solution = 0.6 g

Now, we need to calculate the total mass of the resulting solution after adding water:

Total Mass of Resulting Solution = Mass of Initial Solution + Mass of Water Total Mass of Resulting Solution = 200 g + 100 g Total Mass of Resulting Solution = 300 g

Now we can calculate the mass fraction of the solute in the resulting solution:

Mass Fraction of Solute in Resulting Solution = (Mass of Solute in Initial Solution / Total Mass of Resulting Solution) × 100% Mass Fraction of Solute in Resulting Solution = (0.6 g / 300 g) × 100% Mass Fraction of Solute in Resulting Solution = 0.2%

Therefore, the mass fraction of the solute in the resulting solution is 0.2%.