Question

Химия 9 класс помогите !!!! При электролизе ХЛОРИДА КАЛИЯ массой 500 грамм, СОДЕРЖАЩЕГО 3% ПРИМЕСЕЙ. Получили металл и газ. Вычислите МАССУ ПОЛУЧИВШЕГОСЯ МЕТАЛЛА И ОБЪЕМ ВЫДЕЛИВШЕГОСЯ ГАЗА !!!!!!!

Answer 1

Всё...Если возникнут вопросы, задавай.

Answer 2

Electrolysis of Potassium Chloride Solution

To calculate the mass of the metal obtained and the volume of gas evolved during the electrolysis of a potassium chloride (KCl) solution, we need to consider the given information:

- Mass of the potassium chloride solution: 500 grams - Percentage of impurities in the solution: 3%

To solve this problem, we need to determine the amount of potassium chloride and the amount of impurities in the solution. Then, we can calculate the mass of the metal and the volume of gas produced during electrolysis.

Calculating the Amount of Potassium Chloride and Impurities

To calculate the amount of potassium chloride in the solution, we need to find the mass of pure potassium chloride. We can do this by subtracting the mass of impurities from the total mass of the solution.

Given that the solution contains 3% impurities, we can calculate the mass of impurities as follows:

Mass of impurities = 3% of 500 grams

Now, let's calculate the mass of impurities:

Mass of impurities = 3/100 * 500 grams

To find the mass of pure potassium chloride, we subtract the mass of impurities from the total mass of the solution:

Mass of potassium chloride = Total mass of solution - Mass of impurities

Calculating the Mass of the Metal

During electrolysis, the potassium chloride (KCl) solution is broken down into its constituent elements: potassium (K) and chlorine (Cl2). The metal obtained during electrolysis is potassium (K).

To calculate the mass of the metal obtained, we need to use the concept of stoichiometry. The balanced chemical equation for the electrolysis of potassium chloride is:

2KCl(aq) → 2K(l) + Cl2(g)

From the balanced equation, we can see that for every 2 moles of potassium chloride, we obtain 2 moles of potassium metal.

To calculate the moles of potassium chloride, we use the formula:

Moles of potassium chloride = Mass of potassium chloride / Molar mass of potassium chloride

The molar mass of potassium chloride (KCl) is the sum of the atomic masses of potassium (K) and chlorine (Cl).

Now, let's calculate the moles of potassium chloride:

Moles of potassium chloride = Mass of potassium chloride / Molar mass of potassium chloride

To calculate the mass of the metal obtained, we use the stoichiometry of the balanced equation:

Mass of metal obtained = Moles of potassium chloride * (2 moles of potassium / 2 moles of potassium chloride) * Molar mass of potassium

Calculating the Volume of Gas Evolved

During the electrolysis of potassium chloride, chlorine gas (Cl2) is evolved at the anode.

To calculate the volume of gas evolved, we need to use the ideal gas law equation:

PV = nRT

Where: - P is the pressure of the gas - V is the volume of the gas - n is the number of moles of gas - R is the ideal gas constant - T is the temperature in Kelvin

Since the pressure and temperature are not given in the question, we assume standard temperature and pressure (STP), which is 1 atmosphere of pressure and 273 Kelvin.

To calculate the volume of gas evolved, we need to find the number of moles of chlorine gas. From the balanced equation, we can see that for every 2 moles of potassium chloride, we obtain 1 mole of chlorine gas.

Now, let's calculate the moles of chlorine gas:

Moles of chlorine gas = Moles of potassium chloride * (1 mole of chlorine / 2 moles of potassium chloride)

To calculate the volume of gas evolved, we use the ideal gas law equation:

Volume of gas evolved = Moles of chlorine gas * (R * T) / P

Summary

To summarize, here are the steps to calculate the mass of the metal obtained and the volume of gas evolved during the electrolysis of the potassium chloride solution:

1. Calculate the mass of impurities: Mass of impurities = 3/100 * 500 grams 2. Calculate the mass of potassium chloride: Mass of potassium chloride = Total mass of solution - Mass of impurities 3. Calculate the moles of potassium chloride: Moles of potassium chloride = Mass of potassium chloride / Molar mass of potassium chloride 4. Calculate the mass of the metal obtained: Mass of metal obtained = Moles of potassium chloride * (2 moles of potassium / 2 moles of potassium chloride) * Molar mass of potassium 5. Calculate the moles of chlorine gas: Moles of chlorine gas = Moles of potassium chloride * (1 mole of chlorine / 2 moles of potassium chloride) 6. Calculate the volume of gas evolved: Volume of gas evolved = Moles of chlorine gas * (R * T) / P

Please note that the values of the molar mass of potassium chloride, molar mass of potassium, ideal gas constant (R), pressure (P), and temperature (T) need to be substituted into the calculations.

Unfortunately, the specific values required to perform the calculations are not provided in the question. Therefore, I am unable to provide the exact mass of the metal obtained and the volume of gas evolved. However, by following the steps outlined above and substituting the appropriate values, you should be able to calculate the desired quantities.