Question

Какова масса соляной кислоты (HCI) в растворе массой 300 гс массовой долей 25%?( плотность соляной кислоты 1.19 г/см*) Выберите ответ О 75 гр 083 гр О 95 гр

Answer 1

Ответ:75г
Дано :
w=25%
mр=300г
Решение :
w=mв/mp*100%
25%=x/300*100
х=75г

Answer 2

Calculation of the Mass of Hydrochloric Acid (HCl) in a Solution

To calculate the mass of hydrochloric acid (HCl) in a solution with a mass of 300 g and a mass fraction of 25%, we can use the following steps:

1. Determine the mass of the solvent (water) in the solution: - Since the mass fraction of HCl is 25%, the mass fraction of water is 100% - 25% = 75%. - The mass of water can be calculated as 75% of the total mass of the solution: Mass of water = 75% of 300 g = 0.75 * 300 g = 225 g.

2. Calculate the volume of the solution using the density of hydrochloric acid: - The density of hydrochloric acid is given as 1.19 g/cm³. - We can use the density to calculate the volume of the solution: Volume of solution = Mass of solution / Density of HCl = 300 g / 1.19 g/cm³.

3. Calculate the mass of hydrochloric acid (HCl) in the solution: - Since the mass fraction of HCl is 25%, the mass of HCl can be calculated as 25% of the total mass of the solution: Mass of HCl = 25% of 300 g = 0.25 * 300 g = 75 g.

Therefore, the mass of hydrochloric acid (HCl) in the solution is 75 grams.