Question

Було 300г 5-відсоткового розчинну солі. Через деякий час 50 г води випарували. Яким став відсотковий вміст солі в розчині?

Answer 1

300*0,05=15 гр соли содержится в растворе
после выпаривания масса раствора 300-50=250 гр
(выпарилась только вода , соль осталась)
250 гр -100%
15 гр-х%
15*100/250=6%

Ответ получили 6% раствор соли

Answer 2

Calculation of Salt Concentration After Evaporation

To calculate the new percentage of salt in the solution after 50g of water has evaporated from the 300g 5% salt solution, we can use the following steps:

1. Calculate the amount of salt in the original solution: - The original solution is 5% salt, which means there are 5g of salt in every 100g of solution. - Therefore, the amount of salt in the original 300g solution can be calculated as: \[ \text{Amount of salt} = \frac{5}{100} \times 300 = 15 \, \text{grams} \]

2. Calculate the new total amount of solution after evaporation: - Since 50g of water has evaporated, the new total amount of solution is \(300g - 50g = 250g\).

3. Calculate the new percentage of salt in the solution: - To find the new percentage of salt, divide the amount of salt by the new total amount of solution and multiply by 100: \[ \text{New percentage of salt} = \frac{15}{250} \times 100 = 6\% \]

So, after 50g of water has evaporated, the percentage of salt in the solution becomes 6%.