Question

Если упаривать 500г раствора с массовой жолей моли 10% жо тех пор, пока массовая доля соли не станет равной 14%, то масса выпаренной при этом воды составит. решение

Answer 1

M(ве-ва)=500*0,1=50гр
пусть масса испарившейся воды=х
тогда:
w= m(ве-ва)/m(ра-ра)= 50/500-х=0,14
x=143гр

50/500-143*100=14%

Answer 2

Calculation of the Mass of Evaporated Water

To calculate the mass of evaporated water when concentrating a solution of gelatin, we need to determine the initial and final masses of the solution and the gelatin concentration.

Given: - Initial mass of the solution: 500 g - Initial gelatin concentration: 10% - Final gelatin concentration: 14%

To find the mass of the evaporated water, we can use the following equation:

Mass of evaporated water = Initial mass of solution - Final mass of solution

To find the final mass of the solution, we need to determine the mass of the gelatin in the initial and final solutions.

Calculation of the Mass of Gelatin

To calculate the mass of gelatin, we can use the following equation:

Mass of gelatin = Mass of solution * Gelatin concentration

Let's calculate the mass of gelatin in the initial and final solutions.

Initial mass of gelatin: Mass of gelatin in the initial solution = Initial mass of solution * Initial gelatin concentration

Final mass of gelatin: Mass of gelatin in the final solution = Final mass of solution * Final gelatin concentration

Calculation of the Final Mass of the Solution

To calculate the final mass of the solution, we can use the following equation:

Final mass of solution = Initial mass of solution - Mass of gelatin in the final solution

Now, let's substitute the given values into the equations and calculate the mass of evaporated water.

Mass of gelatin in the initial solution = 500 g * 10% Mass of gelatin in the final solution = 500 g * 14%

Final mass of solution = Initial mass of solution - Mass of gelatin in the final solution

Mass of evaporated water = Initial mass of solution - Final mass of solution

Please note that the exact values for the mass of gelatin in the initial and final solutions are not provided in the question. Therefore, we cannot calculate the exact mass of evaporated water without this information. However, the provided equations and methodology can be used once the mass of gelatin in the initial and final solutions is known.