Question

СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА ПОМОГИТЕ УМОЛЯЮ ПОМОГИТЕ 500 мл раствора содержат 22,2 г хлорида кальция. Определите молярную концентрацию раствора.

Answer 1

Ответ:

Объяснение:1) Определяем молярную массу хлорида кальция:

М(СаСl₂) = 40 + 2*35,5 = 111 г/моль

2) Определяем, сколько молей составляет 22,2 г хлорида кальция:

22,2/111 = 0,2 моль

3) Молярная концентрация показывает сколько молей данного вещества содержится в 1 л (1000 мл) раствора. Составляем пропорцию:

500 мл раствора --------------- 0,2 моль СаСl₂

1000 мл раствора ---------------  Х моль СаСl₂

Х = 1000*0,2/500 = 0,4 моль

Ответ: 0,4 моль/л или 0,4М

Answer 2

Calculation of Molar Concentration of Calcium Chloride Solution

To determine the molar concentration of a solution, we need to know the amount of solute (in moles) and the volume of the solution (in liters). In this case, we are given the mass of calcium chloride and the volume of the solution.

Given: - Mass of calcium chloride = 22.2 g - Volume of solution = 500 mL

To calculate the molar concentration, we need to convert the mass of calcium chloride to moles using its molar mass and then divide by the volume of the solution in liters.

The molar mass of calcium chloride (CaCl2) can be calculated by adding the atomic masses of calcium (Ca) and chlorine (Cl). According to the periodic table, the atomic masses are approximately: - Calcium (Ca) = 40.08 g/mol - Chlorine (Cl) = 35.45 g/mol

Molar mass of calcium chloride (CaCl2) = (1 * Ca) + (2 * Cl) = (1 * 40.08) + (2 * 35.45) = 40.08 + 70.90 = 111.98 g/mol

Now, we can calculate the number of moles of calcium chloride using the given mass and molar mass:

Number of moles of calcium chloride = Mass / Molar mass = 22.2 g / 111.98 g/mol

To convert the volume of the solution from milliliters (mL) to liters (L), we divide by 1000:

Volume of solution in liters = 500 mL / 1000 = 0.5 L

Finally, we can calculate the molar concentration (C) using the formula:

Molar concentration (C) = Number of moles / Volume of solution

Substituting the values we have:

Molar concentration (C) = (22.2 g / 111.98 g/mol) / 0.5 L

Now, let's calculate the molar concentration:

Molar concentration (C) = (0.198 mol) / 0.5 L

Molar concentration (C) ≈ 0.396 mol/L

Therefore, the molar concentration of the calcium chloride solution is approximately 0.396 mol/L.

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