Question

К раствору массой 180 г и массовой долей 5% прибавили 10 г вещества.Массовая доля вещества в полученном растворе равна?

Answer 1

180---5%

10---х%

х=50/180=0,27массовая доля прибавившегося раствора

0,27+5=5,27 общая массовая доля получившегося раствора

Answer 2

Дано:                      Решение:

mр-ра=180г          180г - 100%

Wр-ра=5%               хг    -    5%   =>  180г*5%

__________                                        __________             = 9г

Wв-ва-?                                                         100%

                                 mв-ва= 10г+9г=19г

                                 180г - 100%

                                   19г -    у%         => 100%*19г 

                                                                     ________            = 10,5%

                                                                          180г

Answer 3

Calculation of Mass Fraction in the Solution

To calculate the mass fraction of a substance in a solution, we need to consider the mass of the substance and the total mass of the solution.

Given: - Mass of the solution = 180 g - Mass fraction of the substance in the original solution = 5% - Additional mass of the substance added = 10 g

To find the mass fraction of the substance in the resulting solution, we need to calculate the total mass of the resulting solution.

The total mass of the resulting solution can be calculated by adding the mass of the original solution and the additional mass of the substance added:

Total mass of the resulting solution = Mass of the original solution + Additional mass of the substance added

Let's calculate the total mass of the resulting solution:

Total mass of the resulting solution = 180 g + 10 g = 190 g

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

Mass fraction of the substance in the resulting solution = (Mass of the substance in the resulting solution / Total mass of the resulting solution) * 100%

To find the mass of the substance in the resulting solution, we need to consider the mass of the substance in the original solution and the additional mass of the substance added:

Mass of the substance in the resulting solution = Mass of the substance in the original solution + Additional mass of the substance added

Let's calculate the mass of the substance in the resulting solution:

Mass of the substance in the resulting solution = (Mass fraction of the substance in the original solution / 100%) * Mass of the original solution + Additional mass of the substance added

Substituting the given values:

Mass of the substance in the resulting solution = (5% / 100%) * 180 g + 10 g

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

Mass fraction of the substance in the resulting solution = (Mass of the substance in the resulting solution / Total mass of the resulting solution) * 100%

Let's calculate the mass fraction of the substance in the resulting solution:

Mass fraction of the substance in the resulting solution = (Mass of the substance in the resulting solution / Total mass of the resulting solution) * 100%

Mass fraction of the substance in the resulting solution = ([(5% / 100%) * 180 g + 10 g] / 190 g) * 100%

Calculating the value:

Mass fraction of the substance in the resulting solution = ([(0.05) * 180 g + 10 g] / 190 g) * 100%

Mass fraction of the substance in the resulting solution = (9 g + 10 g) / 190 g * 100%

Mass fraction of the substance in the resulting solution = 19 g / 190 g * 100%

Mass fraction of the substance in the resulting solution = 10%

Therefore, the mass fraction of the substance in the resulting solution is 10%.