Question

В 10 літрах розчину міститься 166 грам KI розчину 1,0 г/мл. Обчислити молярну концентрацію розчину та визначити масову частку речовини у розчині.Очень надо

Answer 1

Рахуємо кількість речовини КІ
n = m / M = 166 / 166 = 1 моль
Рахуємо молярну концентрацію
C = n / V(розчину) = 1 / 10 = 0.1 М
Рахуємо масу розчину
m = ρ * V = 1 * 10 = 10 кг
Рахуємо масову частку КІ
w = m(KI) / m(розчину) = 166 / 10000 = 0.0166 або 1.66%

Answer 2

Calculation of Molar Concentration and Mass Fraction

To calculate the molar concentration and mass fraction of a solution, we need to know the amount of solute (in grams) and the volume of the solution (in liters).

Given: - Amount of solute (KI) = 166 grams - Volume of solution = 10 liters - Density of the solution = 1.0 g/mL

To calculate the molar concentration, we need to convert the amount of solute from grams to moles using the molar mass of KI. The molar mass of KI is the sum of the atomic masses of potassium (K) and iodine (I).

The atomic mass of potassium (K) is approximately 39.10 g/mol, and the atomic mass of iodine (I) is approximately 126.90 g/mol.

The molar mass of KI is calculated as follows: Molar mass of KI = (atomic mass of K) + (atomic mass of I) = 39.10 g/mol + 126.90 g/mol = 166.00 g/mol

Now, we can calculate the molar concentration (C) using the formula: Molar concentration (C) = (amount of solute in moles) / (volume of solution in liters)

First, let's convert the volume of the solution from liters to milliliters: Volume of solution = 10 liters * 1000 mL/liter = 10000 mL

Next, let's calculate the amount of solute in moles: Amount of solute in moles = (amount of solute in grams) / (molar mass of KI) = 166 grams / 166.00 g/mol = 1.00 mol

Now, we can calculate the molar concentration: Molar concentration (C) = 1.00 mol / 10.00 L = 0.10 mol/L

The molar concentration of the solution is 0.10 mol/L.

To calculate the mass fraction, we need to know the mass of the solute and the mass of the solution.

The mass of the solute is given as 166 grams.

The mass of the solution can be calculated using the density of the solution: Mass of solution = (volume of solution) * (density of the solution) = 10000 mL * 1.0 g/mL = 10000 grams

Now, we can calculate the mass fraction: Mass fraction = (mass of solute) / (mass of solution + mass of solute)

Mass fraction = 166 grams / (10000 grams + 166 grams) = 0.0164

The mass fraction of the solute in the solution is approximately 0.0164, or 1.64%.

Therefore, the molar concentration of the solution is 0.10 mol/L, and the mass fraction of the solute in the solution is approximately 1.64%.