Question

Выпаривая 100 грамм воды из 400 грамм соли с массовой долей 50%.определить массовую долю соли в растворе после выпаривания

Answer 1

Масса соли 400*0,5=200г соли       400г-100%     
. (-100г раствора H2O) 300 г           xг----50%     x=400*50/100=200 г соли 300-200=100г воды после выпаривания. x=200/300*100=66,7%
(50%(400г)=(выпаривание)>66,7%(300г)

Answer 2

Calculating the Mass Fraction of Salt in the Solution

To determine the mass fraction of salt in the solution after evaporating 100 grams of water from a 400-gram solution with a mass fraction of 50% salt, we can use the following approach:

1. Initial Mass of Salt and Water: - The initial mass of salt in the solution is 400 grams * 50% = 200 grams. - The initial mass of water in the solution is 400 grams - 200 grams = 200 grams.

2. Mass of Water Evaporated: - Evaporating 100 grams of water from the solution leaves 200 grams - 100 grams = 100 grams of water in the solution.

3. Final Mass of Salt: - Since the mass of salt doesn't change during evaporation, the final mass of salt remains 200 grams.

4. Total Mass of the Solution After Evaporation: - The total mass of the solution after evaporation is 100 grams (water) + 200 grams (salt) = 300 grams.

Calculating the Mass Fraction of Salt in the Solution After Evaporation

To find the mass fraction of salt in the solution after evaporating 100 grams of water, we can use the formula:

Mass Fraction of Salt = (Mass of Salt / Total Mass of Solution) * 100%

Substituting the values we obtained:

Mass Fraction of Salt = (200 grams / 300 grams) * 100% = 66.67%

Therefore, the mass fraction of salt in the solution after evaporating 100 grams of water is approximately 66.67%.