Question

1. Определите молярную концентрацию 20℅-ного раствора хлорида натрия (p = 1,15 г/мл).

Answer 1

Ответ:

3,90 моль/л. Решение написано на фотографии.

Answer 2

Molar Concentration of 20% Sodium Chloride Solution

To determine the molar concentration of a 20% sodium chloride solution, we can use the formula:

Molar concentration (M) = (Percentage concentration / 100) * (Density / Molar mass)

Where: - Percentage concentration = 20% - Density of the solution = 1.15 g/ml - Molar mass of sodium chloride (NaCl) = 58.44 g/mol

Using this information, we can calculate the molar concentration of the solution.

First, we calculate the molar concentration using the given formula:

M = (20 / 100) * (1.15 / 58.44)

Calculating this gives us the molar concentration of the 20% sodium chloride solution.

Calculation

M = (0.20) * (0.0197) M ≈ 0.00394 M

Therefore, the molar concentration of the 20% sodium chloride solution is approximately 0.00394 M.

This calculation is based on the provided formula and the given values for percentage concentration and density of the solution.