Question

Определить массовую долю вещества в растворе помле добавления 25 г соли в 150 г 13% рассола

Answer 1

Масса вещества исходного раствора=150*0,13=19,5гр
W=масса ве-ва/массу ра-ра. 19,5+25/150+25*100=25,4%

Answer 2

Calculating Mass Fraction of Substance in Solution

To determine the mass fraction of a substance in a solution after adding 25g of salt to 150g of 13% brine, we can use the following formula:

Mass Fraction = (Mass of Substance) / (Total Mass of Solution)

Given: - Mass of salt added (m1) = 25g - Mass of 13% brine (m2) = 150g - Percentage of salt in the brine = 13%

Using the formula, we can calculate the mass fraction of the salt in the resulting solution.

Calculation

First, we need to find the initial mass of salt in the 13% brine: - Initial mass of salt in 150g of 13% brine = 13% of 150g - Initial mass of salt in 150g of 13% brine = 0.13 * 150g

Now, we can calculate the total mass of the resulting solution after adding 25g of salt: - Total mass of resulting solution = 150g (initial brine) + 25g (added salt)

Finally, we can use the formula to find the mass fraction of the salt in the resulting solution: - Mass Fraction = (Initial mass of salt + Mass of added salt) / (Total mass of resulting solution)

Result

By performing the calculations, we can determine the mass fraction of the substance in the resulting solution.