In 5.6 liters of water, 140 grams of salt was dissolved. What is the concentration of salt in the resulting solution.

In 5.6 liters of water, 140 grams of salt was dissolved. What is the concentration of salt in the resulting solution. The mass of one liter of water is equal to one kilogram.

Let’s express all the data in kg:

5.6 l = 5.6 kg (as required);

140 g = 0.14 kg.

1) Determine the mass of the resulting solution:

5.6 + 0.14 = 5.74 (kg) is the mass of the solution.

2) Find the concentration of salt in the solution using the proportion.

5.74 kg = 100%;

0.14 kg = x%.

5.74: 100 = 0.14: x;

To find the extreme unknown term of the proportion, you need to multiply the middle terms and divide their product by the known extreme term:

x = 100 * 0.14: 5.74;

x = 2.44 (%).

Answer: The salt concentration is 2.44%.