Question

В 10%ный раствор соли добавили 200г соли и получили 30%ный раствор. Найти начальную массу раствора. ПОЖАЛУЙСТА!! ОЧЕНЬ СРОЧНО!

Answer 1

200 грамм = 20%

200:20=10 грамм на 1% (делим на 20% чтобы найти 1 %)

10*10=100 грамм было изначально

Answer 2

Calculation of Initial Mass of Solution

To find the initial mass of the solution, we can use the concept of the concentration of a solution. The concentration of a solution is defined as the amount of solute (in this case, salt) dissolved in a given amount of solvent (in this case, water).

Let's assume that the initial mass of the solution is x grams.

According to the problem, a 10% solution of salt is prepared by adding 200 grams of salt to the solution. After adding the salt, the concentration of the solution becomes 30%.

We can set up the following equation to solve for the initial mass of the solution:

200 grams of salt / x grams of solution = 30%

To solve for x, we can rearrange the equation as follows:

x = (200 grams of salt) / (30%)

Now, let's calculate the initial mass of the solution:

x = (200 grams) / (0.30) = 666.67 grams

Therefore, the initial mass of the solution is approximately 666.67 grams.

Please note that the values used in this calculation are based on the information provided in the question.