Question

Дано 500г раствора с массовой долей гидроксида натрия 0,2.вычислите массу вещества,которое получается при выпаривании этого раствора.Только с дано и решением

Answer 1

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Answer 2

Given Information:

We are given a solution with a mass fraction of sodium hydroxide (NaOH) of 0.2 and a total mass of 500g.

Solution:

To find the mass of the substance obtained after evaporating this solution, we need to calculate the mass of sodium hydroxide in the solution.

The mass of sodium hydroxide can be calculated using the mass fraction and the total mass of the solution.

Step 1: Calculate the mass of sodium hydroxide in the solution. - Mass fraction of sodium hydroxide (NaOH) = 0.2 - Total mass of the solution = 500g

The mass of sodium hydroxide can be calculated using the formula:

Mass of NaOH = Mass fraction of NaOH × Total mass of the solution

Substituting the given values:

Mass of NaOH = 0.2 × 500g = 100g

Therefore, the mass of sodium hydroxide in the solution is 100g.

Step 2: Calculate the mass of the substance obtained after evaporating the solution.

The mass of the substance obtained after evaporating the solution will be equal to the mass of sodium hydroxide, as there are no other substances mentioned in the question.

Therefore, the mass of the substance obtained after evaporating the solution is 100g.

Answer:

The mass of the substance obtained after evaporating the solution is 100g.